Report of field tests, tank linings and anticorrosion devices in individual dwelling unit gas-tired hot-water tanks, pt. 6, conducted by Alexandria Redevelopment and Housing Authority, Alexandria, Va., Public Housing Administration, Washington, D.C., pt. 7, conducted by Bethlehem Housing Authority, Eethlehem, Pa., Public Housing Administration, Washington, D.C., pt. 8, conducted by Housing Authority of City of Pittsburgh, Pittsburgh, Pa., Public Housing Authority, Washington, D.C.