Perkiomen Water Supply Surveys, 1866
The Water Works in Centre Square, Philadelphia
“Philadelphia Underground,” Jan. 29, 1961
Schuylkill River Hydrographical Survey 1861-66 by H. P. M. Birkinbine
Centennial Exhibition situation plan, 1876
PWD water tech at the Philly Home Show, 1960 (detail)
Lab tech, water cleaning demo, Philly Home Show, 1960
‘Gillette, All By Himself, Gets Fine New Idea On Germ Slaying’
Torresdale Conduit work gang, 12/18/1906
Bureau of Water, Cumberland, west of 13th Street, pipe line, 1907
