Cowpeas: culture and varieties. W. J. Morse. (U.S. Agriculture dept. Farmers’ bul. 1148) 26p pa ’20
Crows
The crow in its relation to agriculture. E. R. Kalmbach. (U.S. Agriculture dept. Farmers’ bul. 1102) 20p pa ’20
Dairy cows
Rules for testing dairy cows for advanced registration. J. B. Fitch and F. W. Atkeson. (Kansas. Agricultural experiment station. Circular 82) 12p pa ’20 Manhattan. Kans.
Dairying
Government exhibit at the 1920 National dairy show. (U.S. Agriculture dept. Department circular 139) 17p pa ’20
Danube river
The Danube. Joseph P. Chamberlain. (U.S. State dept.) 122p pa ’18
Published in 1918 as a confidential document.