http://pec.lib.wvu.edu/record/P228undatedThe Potomac River Valley : an object lesson for development by interstate co-operation.Pamphlet. Reprint of a series of newspaper articles from: <em>The Evening Star </em>(Washington, D.C.). Includes the results of a survey of the Potomac River Basin.Birchfield, James.Pollution--Environmental aspects--United States.Pollution--Health aspects.Pollution--Government policy.Potomac River Valley--Social conditions.Interstate Commission on the Potomac River Basin.Pollution control industry.Potomac River Valley--Economic conditions.14256