"Water Purification Filtration." . . . "Report of the Board of Water Commissioners to the Select and Common Councils of the City of Reading, Pa., pertaining to the purification of the water supply by filtration"@en . . . . . . . . . . . . . . . . "Water-supply Pennsylvania Reading." . . . . "Reading (Pa.). Board of Water Commissioners." . . "Water-supply." . . "Pennsylvania" . .