Grain. Handbook of official grain standards of United States, standards of wheat, effective Oct. 1, 1937, corn, effective Jan. 20, 1937, barley, effective July 1, 1937, oats, effective July 1, 1941, feed oats and mixed feed oats, effective July 1, 1935, rye, effective July 1, 1941, grain sorghums and flaxseed, effective July 1, 1935, soybeans, effective Sept. 1, 1942, and mixed grain, effective July 1, 1935, important features of grain inspection.