Farmer cooperatives have taken root and grown rapidly throughout Iowa in the past 50 years. Probably 70 percent of Iowa farmers are co-op members; the remainder also probably have benefited because of the competitive influence of the co-ops.
Beal, George M.
"Farm Co-ops in Iowa,"
Iowa Farm Science: Vol. 6
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol6/iss7/4