Grain. Handbook of official grain standards of United States, standards for wheat, effective Oct. 1, 1937, corn, effective Jan. 20, 1937, barley and oats, effective July 1, 1937, feed oats, mixed feed oats, rye,, grain, sorghums, and flaxseed, effective July 1, 1935, soybeans, effective Nov. 20, 1940, and mixed grain, effective July 1, 1935, important features of grain inspection.