In 1967, corn and soybeans will still be the high profit crops for Iowa farmers. Hog product in increasing, beef cattle are decreasing, and there are fewer dairy cows, but profit is all on the increase.
Howell, H. B.
"Farm Product Outlook - Optimistic,"
Iowa Farm Science: Vol. 21
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol21/iss7/3