Products from 1 out of every 4 U.S. crop acres now move overseas. Long-run prospects for larger commercial exports affected greatly by the rate of economic progress and per capita income growth in less developed countries.
Heady, Earl O. and Blakeslee, Leroy
"Your Stake in International Economic Development and Foreign Trade,"
Iowa Farm Science: Vol. 20
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol20/iss5/2