Farming around the hills instead of up and down them pays. We are convinced of that after 4 years of comparing yields, measuring soil and water losses and observing the difference in power that contouring takes as compared with up-and-down hill farming.
Browning, G. M.
"Around the Hill Farming,"
Farm Science Reporter: Vol. 7
, Article 7.
Available at: https://lib.dr.iastate.edu/farmsciencereporter/vol7/iss1/7