http://pec.lib.wvu.edu/record/P190021917Some things the experiment stations have found out about nitrogen, nitrogen fixation, and legumes.<p> Serial issue. Issued as: West Virginia University. College of Agriculture. Extension Department. <em>Agricultural summary</em>, no. 2 (1917:June).</p>Dustman, Robert B. (Robert Barclay), 1892-Nitrogen--Fixation.Legumes.Nitrogen.14256