Each year Iowa farmers are using more and more machinery. They are using it to make work on the farm easier. Many farmers also are buying machinery to replace hired labor. These operators are cutting the amount of labor used by boosting their investment in equipment.
Wallace, J. J.
"A Hired Man or More Machinery?,"
Iowa Farm Science: Vol. 1
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol1/iss10/4