http://pec.lib.wvu.edu/record/P33511955A Symposium on supplemental irrigation : a compendium of opinion as expressed in speeches and discussions at a meeting held in Winchester, Virginia on May 12 and 13, 1955. Pamphlet. Issued by: Interstate Commission on the Potomac River Basin. Symposium on Supplemental Irrigation (1955 : Winchester, Va.)Supplemental irrigation--Potomac River Valley.14256