Sewer systems, City of Philadelphia, 1927 and 1929
Frankford Creek Watershed Historical Timeline
Newspaper Clipping Scrapbooks of Frederic Graff Jr.,Chief Engineer of the Philadelphia Water Department: Part 1, 1854-1857
Newspaper Clipping Scrapbooks of Frederick Graff Jr., Chief Engineer of the Philadelphia Water Department. Part 2: 1858-1871
Sewer Demand Taken to City Hall, 7/25/32
Northeast Sewage Plant opening, 1951