Drainage area plan, early 19th century
Philadelphia Navy Yard, July 1872
Southwest Sewage Treatment Plant under construction, 1949
Two Frankford Creek Bridges, 1896-1899
Plan and profile of proposed Delaware Seventh St. Sewer, 1850
Plan of Pine Street Sewer, 1830
Wooden Water Pipe, removed from Market Street, December 6, 1901
Volume of Sludge from 1,000,000 Gallons of Sewage
Diagram Showing Rate Between Bulk of Wet Sludge and Its Percentage Moisture
Wood truss drawbridge, Orthodox Street over Frankford Creek, rebuilt 1899