Autor
Wilson Ornithological Society
3
Agassiz Association. Wilson Ornithological Chapter
1
American Birding Association
1
American Ornithologists' Union
1
Beijing lin ye da xue
1
BirdLife International
1
British Trust for Ornithology
1
Cooper Ornithological Club
1
Cooper Ornithological Society
1
Društvo za opazovanje in proučevanje ptic Slovenije
1
Hortling, Ivar Johannes, 1876-
1
Merikallio, Einari
1
National Audubon Society
1
Nebraska Ornithologists' Union
1
Nordic Council for Wildlife Research
1
Ochrana dravcov na Slovensku (Organization)
1
Polskie Towarzystwo Zoologiczne
1
Quintero Toro, Camilo,
1
Society for Northwestern Vertebrate Biology
1
Suomen Lintutieteellinen Yhdistys
1
Wilson Ornithological Club
1
World Veterinary Poultry Association
1
Zhongguo niao lei xue hui
1