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- Geological Survey (U.S.)41
- Geological Society of London18
- Ruedemann, Rudolf, 1864-19567
- Clarke, John Mason, 1857-19256
- Caley, John Fletcher, 1905-5
- Geological Society of London, issuing body5
- Geological Society of London, publisher5
- Harris, A. L. (Anthony Leonard)5
- Pankhurst, R. J. (Robert J.)5
- Holland, C. H. (Charles Hepworth)4
- International Geological Correlation Programme4
- Scotese, Christopher R.4
- Akademii︠a︡ nauk SSSR3
- American Association of Petroleum Geologists3
- American Geophysical Union3
- Barnes, Christopher R.3
- Barnes, Virgil E. (Virgil Everett), 1903-19983
- Bassett, Michael G.3
- Bohlin, Birger, 1898-19903
- British Museum (Natural History). Department of Geology3