| The cowbirds: a study in the biology of social parasitism H Friedmann (No Title), 1929 | 597 | 1929 |
| Host relations of the parasitic cowbirds H Friedmann Bulletin of the United States National Museum, 1963 | 506 | 1963 |
| Distributional check-list of the birds of Mexico H Friedmann, RT Moore, L Griscom, AH Miller Cooper Ornithological Club, 1950 | 404 | 1950 |
| The parasitic cowbirds and their hosts H Friedmann, LF Kiff Western Foundation of Vertebrate Zoology, 1985 | 364 | 1985 |
| Distributional check-list of the birds of Mexico AH Miller, H Friedmann, L Griscom, RT Moore Part II. Pacific Coast Avifauna 33 (1), 435, 1957 | 346 | 1957 |
| A further contribution of knowledge of the host relations of the parasitic cowbirds H Friedmann, LF Kiff, SI Rothstein | 309 | 1977 |
| Birds of North and Middle America pt. 11: Families Cathartidae, Accipitridae, Pandionidae, Falconidae H Friedmann Bulletin of the United States National Museum, 1950 | 244 | 1950 |
| The symbolic goldfinch: its history and significance in European devotional art H Friedmann (No Title), 1946 | 167 | 1946 |
| The honey-guides H Friedmann Bulletin of the United States National Museum, 1955 | 165 | 1955 |
| Left-handedness in parrots H Friedman, M Davis Auk 55 (3), 478-480, 1938 | 155 | 1938 |
| A bestiary for Saint Jerome: animal symbolism in European religious art H Friedmann, H Sanctus Smithsonian Institution Press, 1980 | 140 | 1980 |
| A contribution to the ornithology of northeastern Venezuela H Friedmann, DS Foster Proceedings of the United States National Museum, 1950 | 112 | 1950 |
| Birds collected by the Childs Frick expedition to Ethiopia and Kenya colony H Friedmann US Government Printing Office, 1930 | 97 | 1930 |
| The parasitic weaverbirds H Friedmann Bulletin of the United States National Museum, 1960 | 78 | 1960 |
| The Evolutionary History of the Avian Genus Chrysococcyx H Friedmann Bulletin of the United States National Museum, 1968 | 72 | 1968 |
| Further information of the host relations of the parasitic cowbirds H Friedmann The Auk 88 (2), 239-255, 1971 | 64 | 1971 |
| Notes on some Argentina birds H Friedmann Museum, 1927 | 47 | 1927 |
| Birds collected by the National Geographic Society's expeditions to northern Brazil and southern Venezuela H Friedmann Proceedings of the United States National Museum, 1948 | 45 | 1948 |
| Birds from Gabon and Moyen Congo Chicago Natural History Museum, H Friedmann, ... Chicago: Chicago Natural History Museum, 1959 | 43 | 1959 |
| The parasitic cuckoos of Africa H Friedmann Washington Academy of Sciences, 1948 | 43 | 1948 |
