"Practically four-fifths of the oat crop of the United States is produced in the thirteen States extending from and Pennsylvania westward to , , , and Kansas. Each of these States annually devotes more than a million acres to oats. The average yield in the six northernmost States, New York, Michigan, Wisconsin, Minnesota, North Dakota, and South Dakota, is 31.68 bushels to the acre, while their total production is slightly less than one-third of the oat crop of this country. The average yield of the other seven States, Pennsylvania, Ohio, Indiana, Illinois, Iowa, Nebraska, and Kansas, is only 29.23 s to the , yet they produce more than half of the entire crop. ... Oats are grown in the , which includes all the States of the second group, largely because a small-grain crop is needed in the and because the grain is desired for feeding to work stock. is seldom satisfactory in this district, and winter crops often do not fit well into a rotation which ordinarily includes corn, a small grain, and grass. Under these conditions oats are generally grown as the best crop between corn and grass. This is particularly true in Illinois and Iowa, the two States producing the greatest quantifies of both corn and oats."