Exploring the Lenapehoking Watershed on Native American Heritage Day
Delaware River at Arch Street from the New Jersey side, 1914
Bacteria in Delaware River, Torresdale Filters, 1913
Water, Water Everywhere – Philadelphia Record, 1937-03-14
Arch Street Ferry, Philadelphia
The City and Port of Philadelphia on the River Delaware from Kensington, 1800
Map of the County of Philadelphia from Actual Survey, 1843
Philadelphia the Manufacturing and Industrial Capital map, 1906
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
Penn’s Treaty with the Indians (Watson’s Annals)
