Report of the advisory panel on the California condor
1978
Ricklefs, Robert E. |
Vultures
Conservation studies on raptors : based on the proceedings of the second World Conference on Birds of Prey held in Thessaloniki, Greece, April 1982
1985
Newton, Ian |
Chancellor, R. D. |
Effects of the Sespe Creek Project on the California condor : administrative report
1969
Sibley, Fred C. |
The hawks of North America : their field identification and feeding habits
1935
May, John Bichard |
Birds of prey
1964
Sokotowski, Jan |
