The New Student's Reference Work (1914)
“ Natural Resources. The state is preeminently an agricultural one, raising the chief cereals, including corn, wheat, oats, rye and barley, besides hay and potatoes. The farmland area is about 39,000,000 acres, the acreage in 1909 in the following crops being corn, 7,266,000 acres; wheat, 2,662,000 acres; oats, 2,365,000 acres; hay and forage, 4,520,000 acres. There is now considerable stock-raising, with an increasing number of dairy-cows and other cattle, horses, sheep and swine. ”
