Iowa State College. Extension Service. (1934). Extension circular. Iowa State College of Agriculture and Mechanic Arts.
Citace podle Chicago (17th ed.)Iowa State College. Extension Service. Extension Circular. Ames, Iowa: Iowa State College of Agriculture and Mechanic Arts, 1934.
Citace podle MLA (8th ed.)Iowa State College. Extension Service. Extension Circular. Iowa State College of Agriculture and Mechanic Arts, 1934.
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