Food habits of North American diving ducks
By: by Clarence Cottam.
Contributors: United States. Dept. of Agriculture.
Series: Technical bulletin -- no. 643
Publisher: United States Dept. of Agriculture
Published: 1939
Place of publication: Washington, D.C
Language: eng
Number of pages: 140
Subjects: Ducks -- Feeding and feeds
Notes: Caption title.

Bibliography: p. 135-139.