http://pec.lib.wvu.edu/record/P189791916Amount and cost of labor required for growing crops in West Virginia.<p> Serial issue. Issued as: West Virginia University. Agricultural Experiment Station. <em>Bulletin</em>, no. 163 (1916:Nov.). Digital copy available through the Internet Archive.</p>Johnson, O. M. (Orville M.)Dadisman, A. J. (Andrew Jackson), 1881-Agriculture--West Virginia--Costs.14256