Books+ Search Results

Subject: "Meteorology."
Location: Is Yale University Library
Author
Bouman, D. J.
Published
's-Gravenhage : Staatsdrukkerij, 1964.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 N38 84
Library Shelving Facility (LSF) >> QC874 B68
Format
Books
Author
Kaiser, Heinz
Published
Offenbach a.M, [s.n.] 1959.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 53
Format
Books
Author
Kraus, Helmut, 1930-
Published
Offenbach a.M., [s.n.] 1958.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 48
Format
Books
4.
Author
New York University. School of Engineering and Science
Published
New York.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +N45
Format
Journals & Newspapers
Published
Chicago, Ill. : University of Chicago Press, 1944-
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +C42
Format
Books
Published
Chicago, Ill. : University of Chicago Press, 1942-1944.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +C42
Format
Books
Author
Petterssen, Sverre, 1898-
Published
Oslo, I kommisjon hos Cammermeyers boghandel, 1939.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Sb21 O251 12
Format
Books
Author
Petterssen, Sverre, 1898-
Published
Oslo, I kommisjon hos Cammermeyers boghandel, 1936.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Sb21 O251 11
Format
Books
Author
Taylor, Thomas Griffith, 1880-1963
Published
[Melbourne] : A.J. Mullett, govt. printer, 1916.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh8 A8 +A18 14
Format
Books
Author
Moore, Willis L. (Willis Luther), 1856-1927
Published
London, 1898.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> E10 R81g 12
Format
Books
Author
Schneider, Friedrich Adolph
Published
Berlin : Bei List und Francke in Leipzig, 1866-1868.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh26 +864s
Format
Books
Author
Schneider, Friedrich Adolph
Published
Berlin : Bei List und Francke, in Leipzig, 1865.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh26 +864s
Format
Books
Author
Deutscher Wetterdienst in der U.S. Zone
Published
[Bad Kissingen]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A117
Library Shelving Facility (LSF) >> Rhh5 G5 +A118
Format
Books
Published
Hamburg : Deutscher Wetterdienst, Seewetterdienst.
Location
Library Shelving Facility (LSF) >> Rhh5 G2 +A119
Unavailable--Try BorrowDirect or Interlibrary Loan >> RRhh5 G2 A119
Format
Journals & Newspapers
Author
Backer, Simon de
Published
Bruxelles, 1965.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> U10 B84 II 16:3
Format
Books
Author
Bouman, Dirk Jan
Published
s'-Gravenhage [Neth.] : Staatsdrukkerij- en Uitgeverijbedrijf, 1961.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 N38 79
Format
Books / Dissertations & Theses
Author
Hounam, C. E.
Published
Melbourne, Director of Meteorology, 1961.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh8 A8 +A18 44
Format
Books
Author
Die Meteorologische Tagung in Garmisch-
Published
Offenbach a,M., [s.n.] 1959.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 51
Format
Books
Author
Guss, Hans
Published
Offenbach a,M., [s.n.] 1959.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 52
Format
Books
Author
Hartmann, Friedrich-Karl
Published
Offenbach a.M, [s.n.], 1959.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 50
Format
Books
Author
Haarlander, Hans
Published
Offenbach, a.M., [s.n.], 1959.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 55
Format
Books
Author
Boucher, Roland J.
Published
Milton, Mass., Blue Hill Meteorological Observatory, 1955.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +B64 1
Format
Books
Author
Expéditions polaires françaises
Published
Paris 1954.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhk8 +Ex71
Library Shelving Facility (LSF) >> QC857 G7 E94 (LC) Oversize
Format
Books
Author
Havana (Cuba). Observatorio nacional
Published
Habana, 19
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhg6 C8 A13
Library Shelving Facility (LSF) >> Rhg6 C8 A13
Format
Journals & Newspapers
Author
Eliassen, Arnt
Published
Oslo, Grøndahl & sons boktr., I kommisjon hos Cammermeyers boghandel, 1949.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Sb21 O251 17
Format
Books
Author
Venho, S. M.
Published
1949.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 F5 A18 33
Format
Books / Dissertations & Theses
27.
Author
Kimble, George Herbert Tinley, 1908-
Published
New York, Penguin books, inc. [1946]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh20 946k
Format
Books
Published
Berlin [etc.] J. Springer [etc.]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A112
Library Shelving Facility (LSF) >> Rhh5 G2 +A112
LSF-Use in SML, Manuscripts and Archives only (Non-Circ) >> Rhh5 G2 +A112
Format
Journals & Newspapers
Author
Australia. Bureau of Meteorology
Published
Melbourne, H.J. Green [1925]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh8 A8 +A18 17
Format
Books
Author
Bigelow, Frank H. (Frank Hagar), 1851-1924
Published
Buenos Aires, Printing Establishment of the Argentine Meteorological Office, 1912.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +Ar3 2
Format
Books
Author
Bjerknes, V. (Vilhelm), 1862-1951
Published
Washington, D.C., Carnegie Institution of Washington, 1910-11.
Location
SML, Folio Collection (Restricted Use) >> RRh45 910b
Library Shelving Facility (LSF) >> Rh45 +910b
Unavailable--Try BorrowDirect or Interlibrary Loan >> RRh45 910b
Library Shelving Facility (LSF) >> Rh45 +910b
Format
Books
Author
Rijckevorsel, Elie van, 1845-1928
Published
Rotterdam, W.J. van Hengel, 1905-
Location
Library Shelving Facility (LSF) >> Rh49 +905r
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 N38 16-17 etc.
Format
Books
Author
Zentralanstalt für Meteorologie und Geodynamik (Austria)
Published
Wien, In Kommission bei Gerold [etc.]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 A9 +A18
Format
Journals & Newspapers
Author
Convention of Weather bureau officials
Published
Washington, Govt. print. off., 1899-1904.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 Un4 24 etc
Format
Books
Author
Chevalier, Stanislas, 1852-1930
Published
Chang-Hai, Imprimerie de la mission catholique á l'orphelinat de T'ou-Sè-Wè, 1897.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh6 C51 +897c
Format
Books
Author
New England Meteorological Society
Published
[Boston, Mass.]
Location
Library Shelving Facility (LSF) >> Rh10 +N423a
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +N423 39-88
Format
Journals & Newspapers
Author
United States. Army. Signal Corps
Published
Washington : War Dept., Office of the Chief Signal Officer of the Army of the United States.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhg +B87
Format
Journals & Newspapers
Author
Università di Palermo. Osservatorio astronomico
Published
[Palermo]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 I8 +P17
Format
Journals & Newspapers
Author
Universitetet i Oslo. Astronomiske og magnetiske observatorium
Published
Christiania : H.J. Jensen, 1865-68.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 N8 +Os5
Library Shelving Facility (LSF) >> Rhh5 N8 +Os6
Format
Books
Author
Maritime Conference (1853 : Brussels, Belgium)
Published
[Brussels : s.n., 1853]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> 31 61
Library Shelving Facility (LSF) >> Rh10 +M33 1853
Format
Books
Published
Torino : Società meteorologica Italiana,
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 I8 +So3
LSF-Use in SML, Manuscripts and Archives only (Non-Circ) >> Rhh5 I8 +So3
Format
Journals & Newspapers
Author
Università di Modena. R. Osservatorio geofisico
Published
Modena : Società tipografica modenese.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Sb21 0452
Format
Journals & Newspapers
43.
Author
International Meteorological Congress
Published
London, H.M. Stationery Off.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 Un4 11
Library Shelving Facility (LSF) >> Rh10 In8
Format
Journals & Newspapers
Author
United States. Flight Standards Service
Published
Washington, D.C. : Dept. of Transportation, Federal Aviation Administration, Flight Standards Service : Dept. of Commerce, National Oceanic and Atmospheric Administration, National Weather Bureau : For sale by the Supt. of Docs., U.S. G.P.O., 1982.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> TD 4.408:W 37/975
Format
Books
Published
[Washington, D.C.?] : The Administration : For sale by the Supt. of Docs., U.S. G.P.O., 1980.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> TD 4.32/19:8740-30
Format
Books
46.
Author
Taylor Instrument Companies
Published
Rochester, N.Y. : Taylor Instrument Co.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 T212
Format
Journals & Newspapers
Author
Leslie, John, Sir, 1766-1832
Published
Edinburgh : Printed by Abernethy & Walker for William and Charles Tait : London : Longman, Hurst, Rees, Orme, and Brown, 1820
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rha25 817j
Format
Books
48.
Author
Lottin, Victor Charles, 1795-1858
Published
Paris, A. Bertrand [184-?]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> SS47 42
Unavailable--Try BorrowDirect or Interlibrary Loan >> SS47 42
Unavailable--Try BorrowDirect or Interlibrary Loan >> S47 42 2-4
Format
Books
Author
Jewett, Brian F.
Published
Boulder, Colo. : The Program, [1990]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> C 55.8:W 72/4
Format
Books
Published
Stockholm : Institut,
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 S8 +A172
Format
Journals & Newspapers
Author
Chile. Oficina Meteorológica
Published
Santiago de Chile : Seccíon impresiones del Instituto meteorológico, 1913.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhg7 C5 A112 4
Format
Books
Author
Bigelow, Frank H. (Frank Hagar), 1851-1924
Published
Buenos Aires, Printing Establishment of the Argentine Meteorological Office, 1911.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +Ar3 1
Format
Books
Author
Ekholm, Nils Gustaf, 1848-
Published
Stockholm, 1909.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Nk10 Y6 28
Format
Books
54.
Author
Shanghai Meteorological Society
Published
Zi-ka-wei : Printed at the Catholic Mission Press.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +Sh2
Unavailable- email beinecke.library@yale.edu for status >> Rh10 Sh2
Format
Journals & Newspapers
Author
McLandsborough, John, 1820-1900
Published
[Leeds, 1884-1900]
Location
Library Shelving Facility (LSF) >> QH1 Y67 A4 VIII
Unavailable--Try BorrowDirect or Interlibrary Loan >> S8y 495 VIII
Format
Books
Published
Washington : U.S. Govt. Print. Off., 1978-
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> C 1.8/4:1/2
Format
Books
Author
Manier, Gerhard
Published
Offenbach a.M., Selbstverlag des Deutschen Wetterdienst, 1971.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 124
Format
Books
Author
Peters, Sidney Percival
Published
London: H. M. Stationery off., 1932.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> S21 0265 56
Format
Books
59.
Author
Sveriges meteorologiska och hydrologiska institut
Published
Stockholm.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 S8 +A17
Format
Journals & Newspapers
Author
American Association of State Weather Services
Published
Washington, Gov't. print. off., 1893-96.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 Un4 7 etc
Format
Books
Author
Middendorf, Woldemar von
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> S26 0100 1
Format
Books
Author
Read, Peter L., 1953-
Published
Berlin ; New York : Springer ; Chichester, UK : Published in association with Praxis Pub., c2004.
Location
Request for delivery to any Yale Library >> QB641 R355X 2004 (LC)
Format
Books
Published
Silver Spring, Md. : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Weather Service, [1988-
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> C 1.8/4:1/-
Format
Books
Author
Verploegh, G.
Published
The Hague : Staatsdukkerij-en Uitgeverijbedrijf, 1967.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 N38 89
Format
Books
Author
International Meeting on Alpine Meteorology (5th : 1958 : Garmisch-Partenkirchen)
Published
Offenbach a.M., [s.n.], 1959.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 54
Format
Books
Author
Geiger, Rudolf, 1894-
Published
Cambridge, Published for Blue Hill Meteorological Observatory, Harvard University, by Harvard University Press, 1957.
Location
Library Shelving Facility (LSF) >> QC861 G957
Unavailable--Try BorrowDirect or Interlibrary Loan >> ZB G27 1(1965)
Format
Books
Author
Zagreb (Croatia). Višinski Meteorološki Opservatorij Sljeme
Published
Zagreb.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 +J9 +Z21
Format
Journals & Newspapers
68.
Author
New York University. Dept. of Meteorology and Oceanography
Published
New York.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +N45
Format
Journals & Newspapers
69.
Author
Humphreys, W. J. (William Jackson), 1862-1949
Published
New York, London, McGraw-Hill Book Company, inc., 1940.
Location
Library Shelving Facility (LSF) >> QC861 H8 1940
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh20 940h
Library Shelving Facility (LSF) >> QC861 H8 1940
Format
Books
Published
Trieste : Tip. del Lloyd Austriaco, 1903-191.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 A988 +T73
Format
Journals & Newspapers
Author
Rowell, G. A. (George Augustus), 1804-1892
Published
London ; Edinburgh : Published by Williams and Norgate ... and by the author ..., 1871.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh12 R88 1
Format
Books
Author
Meteorological Society of Mauritius
Published
Mauritius.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 M44
Format
Journals & Newspapers
Author
India. Meteorological Dept
Published
Calcutta : Meteorlogical Office,
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh6 I5 +A15
Format
Journals & Newspapers
Author
Observatoire de Genève
Published
Genève.
Location
Library Shelving Facility (LSF) >> Rhh5 S9 G285
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 S9 G286 1- 1927-
Format
Journals & Newspapers
75.
Author
United States. Federal Aviation Administration
Published
[Washington] : Dept. of Transportation, Federal Aviation Administration, 1978.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> TD 4.8/5:00-24 A
Format
Books
Author
Mommsen, August, 1821-1913
Published
[n.p.] 1870.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G91 +1
Format
Books / Dissertations & Theses
Published
Washington, D.C. : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Weather Service : U.S. Dept. of Transportation, Federal Aviation Administration : For sale by the U.S. G.P.O., Supt. of Docs., 1995.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> TD 4.8/5:00-45 D
Format
Books
Published
Silver Spring, Md. : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Weather Service, 1980-
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> C 55.108/4:4/3
Format
Books
Author
Brooke, Charles, 1804-1879
Published
London : Printed by R. and J.E. Taylor, 1850.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Re24 099 2
Format
Books
Published
Bruxelles, Belgium : [s.n.],
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> U10 B84 1-II.17
Format
Journals & Newspapers
Author
Similä, A.
Published
Helsinki, Finland : Valtioneuvoston kirjapaino, 1944.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 F5 A18 22
Format
Books
82.
Author
NEXRAD Joint System Program Office (U.S.)
Published
[Washington, D.C.?] : U.S. Dept. of Commerce, [1983]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> C 1.80:R 400-OC 201
Format
Books
Author
United States. Flight Standards Service
Published
Washington : Dept. of Transportation, Federal Aviation Administration, Flight Standards Service : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1977-
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> TD 4.8/5:00-45 A
Format
Books
Published
[Washington, D.C.? : National Aeronautics and Space Administration : Department of Commerce, National Oceanic and Atmospheric Administration, 2001]
Location
Library Shelving Facility (LSF) >> NAS 1.83:2001-7-324-GSFC
Yale University Library >> TL798.M4 G64 2001
Format
Books
Author
Borchardt, H.
Published
Offenbach a.M., Selbstverlag des Deutschen Wetterdienst, 1971.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 G2 +A118 125
Format
Books
Author
Geological Survey (U.S.)
Published
[Reston, Va.?] : The Survey, [1982?]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> I 19.79:C 72
Format
Maps & GIS
Author
Stednick, John D.
Published
[Portland, Or.] : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, [1981]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> A 13.78:PNW-291
Format
Books
Author
Ryan, Bill C.
Published
Berkeley, Calif. : Dept. of Agriculture, Forest service, Pacific Southwest Forest and Range Experiment Station, 1976.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> A 13.79:PSW-320
Format
Books
Published
Bozeman, Mont. : Soil Conservation Service, 1975.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> A 57.2:P 91
Format
Books
Author
Mæhlum, B. (Bernt)
Published
Oslo, I kommisjon hos Aschehoug, 1958.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Sb21 0251 20
Format
Books
Published
[Bruxelles, 1957-60]
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> U10 B84 II 8 etc
Format
Books
Author
Expéditions polaires françaises
Published
Paris, 1955.
Location
Library Shelving Facility (LSF) >> QC982 E93 (LC) Oversize
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhk9 +Ex73
Format
Books
Author
Bourguignon, R.
Published
[Bruxelles : Institut Royal Colonial Belge, 1951].
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> U10 B84 6:4
Format
Books
Author
Jalu, R.
Published
Paris : Météorologie nationale, 1950.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rh10 +F84 33
Format
Books
Author
Schou, Georg, 1900-
Published
Oslo : I kommisjon hos Cammermeyers boghandel, 1939.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Sb21 O251 14
Format
Books
Author
Catalano, Luciano R.
Published
Buenos Aires : Imprenta y Casa Editora "Coni", 1926.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Argentin E10 B86a 11
Format
Books
Published
México : Departamento de Imprenta de la Secretaría de Fomento, 1916.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhg5 M3 +A13
Format
Journals & Newspapers
Author
International Polar Expedition, 1882-1883
Published
Stockholm, P. A. Norstedt, 1886-93.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> S23 096
Format
Books
Published
Budapest : Országos Meteorológiai Szolgálat, 1871-
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rf3 H9 +H92
Format
Journals & Newspapers
Author
Zentralanstalt für Meteorologie und Geodynamik (Austria)
Published
Wien.
Location
Unavailable--Try BorrowDirect or Interlibrary Loan >> Rhh5 +A9 +A11
Format
Journals & Newspapers