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MLA

Combs, Willis B. (Willis Becker), and Fred G. (Fred George) Smith. "Grain Grading Primer." , p.. Print

APA

Combs, W. B. (Willis Becker), & Smith, F. G. (Fred George). (1953). Grain grading primer.

Chicago

Combs, Willis B. (Willis Becker), and Fred G. (Fred George) Smith. "Grain grading primer" (0000): p..