http://pec.lib.wvu.edu/record/P98241965Carbon bed design criteria study at Nitro, W. Va.Journal article reprint from: American Water Works Association. <em>Journal</em>, v.57:no.5 (1965:May).<br />Robeck, Gordon G.Dostal, Kenneth A.Pierson, Rex C.Hager, Donald G.Carbon.Water--Purification--West Virginia--Nitro.14256