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 the Sandy and Beaver canal; dam on the James River and Kanawha canal, Virginia; locks of eight feet lift, on the same; aqueducts across Rivanna River and Byrd Creek, on the same; superstructure, of farm bridges, on the same; lock gates and mitre sills /