http://pec.lib.wvu.edu/record/P167991937A Comparison of grazing and clipping for determining the response of permanent pastures to fertilization. Journal article reprint from: <em>Journal of the American Society of Agronomy</em>, v.29:no.5 (1937:May).Ackerman, R. A.Robinson, R. R.Pierre, W. H. (William Henry), 1898-Pastures--Research--West Virginia.Grazing.Pastures--Fertilizers.Forage plants--West Virginia--Field experiments.14256