1. Soybeans as a homegrown supplement for dairy cows;McClandish;Iowa Agri. Exp. Sta., Bulletin,1922
2. Soybean oilmeal and ground soybeans as protein supplements in the dairy ration;Fairchild;Purdue Univ. Agri. Exp. Sta., Bulletin,1924
3. Soybeans for dairy cows;Olson;South Dakota Agri. Exp. Sta., Bulletin,1925
4. Soybeans and soybean hay in the dairy ration;Schaefer;Minnesota Agri. Exp. Sta., Bulletin,1927
5. Hayden, C. C, and Perkins, A. E.: Soybeans and soybean oilmeal for milk production. Ohio Agri. Exp. Sta., Bi-Monthly Bulletin, 11: No. 4, p. 137–141. July, 1926.