1. Overwintering of woodpeckers in bark beetle-infested spruce-fir forests of Colarado;Baldwin;Proc. 12 int. Orn. Congr.,1960
2. Adaptive modifications in the woodpeckers;Burt;Univ. Calif. Pubis Zool.,1930
3. Birds of the Soviet Union;Dement'ev;Israel Program for Scientific Translations,1966
4. Adaptive modifications and ecological isolating mechanisms in the thrush genera Catharus and Hylocicla;Dilger;Wilson Bull,1956
5. A new race of the yellow-bellied sapsucker;Ganier;Migrant,1954