In our war effort to produce more food, let’s work our level and low soils harder and take the crop producing load off the farms that are rolling, rough and liable to erode.
Van Vlack, C. H. and Campbell, Maurice
"Drainage is Still a Problem,"
Farm Science Reporter: Vol. 4
, Article 2.
Available at: https://lib.dr.iastate.edu/farmsciencereporter/vol4/iss4/2