Author/Creator
- National Audubon Society7
- U.S. Fish and Wildlife Service6
- American Institute of Physics5
- Official Airline Guides, inc5
- Economist Intelligence Unit (Great Britain)4
- Geological Survey (U.S.)4
- Organisation for Economic Co-operation and Development4
- Smithsonian Institution. Bureau of American Ethnology4
- American Bar Association. Section of International Law and Practice3
- American Birding Association3
- Arnold Arboretum3
- Council of Societies for the Study of Religion3
- Eastern States Archeological Federation (U.S.)3
- Inland Bird Banding Association (U.S.)3
- North American Economics and Finance Association3
- Queen Mary and Westfield College (University of London). Centre for Commercial Law Studies3
- Rossiĭsko-amerikanskai︠a︡ kompanii︠a︡3
- Southern Methodist University3
- U.S. Fish and Wildlife Service. Division of Migratory Bird Management3
- United States. Weather Bureau3