http://pec.lib.wvu.edu/record/P190071919Some things the experiment stations have found out about organic matter, green-manures, and the use of cover crops.<p> Serial issue. Issued as: West Virginia University. College of Agriculture. Extension Department. <em>Agricultural summary</em>, no. 9 (1919:Jan.).</p>Dustman, Robert B. (Robert Barclay), 1892-Cover crops.Soils.Manures.14256