http://pec.lib.wvu.edu/record/P84101951Youghiogheny River watershed, Pennsylvania, Maryland, and West Virginia : program for runoff and waterflow retardation and soil erosion prevention.Pamphlet. "Pursuant to the act approved June 22, 1936 (49 Stat. 1570) as amended and supplemented by the act approved August 28, 1937 (50 Stat. 876)."United States. Department of Agriculture.Youghiogheny River Watershed.14256