1. The Red Crossbills of Colorado;Bailey;Publs. Denver mus. Nat. Hist.,1953
2. The Crossbill invasion of Great Britain in 1953;Barraud;Br. Birds,1956
3. Adaptations for food-getting in the American blackbirds;Beecher;Auk,1951
4. The palatine process of the premaxilla in the Passeres;Bock;Bull. Mus. comp. Zool. Ham.,1960