82 PRACTICAL CORN CULTURE 
‘‘Soy Beans.’’ By Piper and Nielson. U.S. Farmers’ Bul- 
letin, No. 372. 
“The Culture of Soy Beans.’’ By Leonard Hegnauer. Il- 
linois State Register, June 30, 1913. 
**Cowpeas.’’ By Griffith. Fruit Grower and Farmer. May, 
1913. 
‘‘The Vetch Book.’’ By William C. Smith. 
‘‘Vetches.’’ By Piper and McKee. U. 8. Farmers’ Bulle- 
tin, No. 515. 
‘‘A Great Alfalfa Campaign.’’ The Breeders’ Gazette. May 
21, 1913. 
‘*Alfalfa.’’ By Peter C. Swartz. Farmers’ Review. Feb. 
22, 1913. 
“Seeding Alfalfa.’’ By Rupert L. Stewart. Weekly Star. 
Jan. 21, 1913. 
‘* Alfalfa on Illinois Soil.’? By Cyril G. Hopkins. Bulletin 
No. 26, Ill. Agri. Ex. Sta. 
“‘Sweet Clover.’’ By Alson Secor. Successful Farming, 
October, 1913. 
