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Fairmount Dam Fish Ladder diagram
Wissahickon Pipe Aqueduct, Roxborough to Mt. Airy, 1868
PWD Drinking Water Treatment diagram
Typhoid bacteria diagram, 1905
Fairmount Water Works from the forebay, 1833
Volume of Sludge from 1,000,000 Gallons of Sewage
Diagram Showing Rate Between Bulk of Wet Sludge and Its Percentage Moisture
Diagram Showing Decreased Amount of Dissolved Oxygen in Delaware River, 1913
Philadelphia Ash Service – Plan, Side and End Elevations of Car
Northern Liberties and Spring Garden Water Works
View from the Inclined Plane near Philadelphia, 1838
Diagram showing heights of reservoirs, dams, standpipes &c, 1894
Old Rosin the Beau, title page, 1838
New Mill House at Fairmount
Baldwin Locomotive Works
1855 bird’s eye litho of Philadelphia
Wastewater Treatment Process diagram
Keystone Saw Works
New Lutheran Church in Fourth Street, Philadelphia