Map Lovers’ Monday: Circles of Destruction
Map Lovers’ Monday: Philadelphia in 1957, according to the Pennsy
Buried Treasures No. 1: The Franklin Sugar Refinery
Early photographs of Fairmount and vicinity, 1848
Early visions of Philadelphia’s airport
Frankford Creek Watershed Historical Timeline
Frankford Creek Watershed in the context of the development of Philadelphia’s sewers and sewage treatment system
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
Cobbs Creek in the Days of the Old Powder Mill
