Contrary to the rather popular statement that Iowa is a surplus corn producing state, we find a four year average showing only 15 percent of Iowa's corn crop entering commercial channels.
First, in this bulletin we show that portion of the crop which is sold off the farm as cash grain. The figures bring out the variation in the commercial surplus from year to year.
Bentley, Ronald C.
"The movement of Iowa's commercial corn and oats,"
Bulletin: Vol. 21
, Article 1.
Available at: https://lib.dr.iastate.edu/bulletin/vol21/iss252/1