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- Yale University. Department of Astronomy, issuing body40
- Eidgenössische Technische Hochschule Zürich39
- Yale University. Department of Physics, issuing body10
- Catholic University of America8
- Yale University. Dept. of Physics, issuing body8
- Sonoran Desert Field Station (Tucson, Ariz.)7
- Natuurwetenschappelijke Studiekring voor Suriname en de Nederlandse Antillen4
- Svenska växtgeografiska sällskapet4
- Denny, David W.3
- Eidgenössische Technische Hochschule3
- Louisiana Wild Life and Fisheries Commission3
- Lunds universitet3
- Peacock, Charles R.3
- Stottlemyer, Thomas Richard3
- Universität Bonn. Mathematisch-Naturwissenschaftliche Fakultät3
- University of Michigan. School of Forestry and Conservation3
- Adams, Dale W.2
- Adler, Ralph Peter Isaac2
- Amin, Shaikh Ruhul2
- Artis, Dean Richard2