Food Habits of North American Diving Ducks
By: by Clarence Cottam.
Series: Technical bulletin / United States Department of Agriculture -- no. 643.
Publisher: U.S. Dept. of Agriculture
Published: 1939
Place of publication: Washington
Language: eng
Number of pages: 140
Subjects: Ducks -- Feeding and feeds
Notes: Cover title.

Contribution from Bureau of Biological Survey.

Literature cited: p. 135-139.