Reports, Specifications, and Estimates of Public Works in the United States of America; Comprising the Philadelphia Gas Works Reservoir Dam Across the Swatara Twin Locks on the Schuylkill Canal Delaware Breakwater Philadelphia Water Works Dam and Lock on
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Reports, Specifications, and Estimates of Public Works in the United States of America; Comprising the Philadelphia Gas Works Reservoir Dam Across the Swatara Twin Locks on the Schuylkill Canal Delaware Breakwater Philadelphia Water Works Dam and Lock on
