FOOD HABITS of NORTH AMERICAN DIVING DUCKS (Technical Bulletin No. 643, April 1939). CLARENCE COTTAM, United States Department of Agriculture, Washington, D. C., 1939.
 
Yellow soft-cover with black title and fancy block border. Secure binding with clean pages and a lightly rubbed cover. Owner ink name at front cover. Just over 9 x 5-3/4 with 140 pages. Photographic illustrations and drawings.