Food of game ducks in the United States and Canada /
by A.C. Martin and F.M. Uhler.
- Washington, D.C. : U.S. Dept. of Agriculture : For sale by the Supt. of Docs., [1939]
- 157 p., 153 p. of plates : ill. (1 col.), maps ; 23 cm.
- Technical bulletin / United States Department of Agriculture ; no. 634 .
- Technical bulletin (United States. Department of Agriculture) ; no. 634. .
Cover title. "March 1939."
Includes bibliographical references (p. 143-147) and index.