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Grain grading primer /
by Willis B. Combs and Fred G. Smith.

APA Citation

Combs, W. B. (Willis Becker)., Smith, F. G. (Fred George). (1953). Grain grading primer. Washington, D.C.: U.S. Dept. of Agriculture.

MLA Citation

Combs, Willis B. (Willis Becker), 1894-, and Fred G. (Fred George) Smith. Grain Grading Primer. Washington, D.C.: U.S. Dept. of Agriculture, 1953.

Warning: These citations may not always be complete (especially for serials).