Any Iowa farmer can tell you that the last half century has brought tremendous changes in farming-new machines, improved crop varieties, better feeding methods, improved livestock and increased use of fertilizers. These things have resulted in changes in both farm operation and in family living.
Beneke, Raymond R. and Halter, Albert
"What's Happening to Iowa Agriculture?,"
Iowa Farm Science: Vol. 9
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol9/iss8/2