British Birds with Their Nests and Eggs
BUTLER, Arthur G.
A History of the Birds of New Zealand, Second Edition
BULLER, Walter Lawry
Arizona and Its Bird Life
Life Histories of North American Birds, with Special Reference to their Breeding Habits and Eggs
Birds of Cyprus
BANNERMAN, David A. and W. Mary.
The History of American Ornithology Before Audubon
Allen, Elsa Guerdrum.
The Birds of Sikkim
The Birds of Newfoundland Labrador
Austin, Oliver L., Jr.
British Birds' Eggs & Nests
Atkinson, Rev. Canon
Catalogue of the Birds of the Americas and Adjacent Islands, Part I, Number 4. Cathartidae - Accipit
Hellmayr, Charles E; Conover, Boardman; Cory, Charles B.