Subjects Natural Environment

Delaware Caves

Caves and inhabitants on the Delaware River, Watson’s Annals

A man fishing from the banks of the Schuylkill River

Fishing in the Schuylkill

Photo of Allegheny Avenue Sewer, Pier 126, Delaware River, July 15, 1918

Allegheny Avenue Sewer at Pier 126, 1918

A list of rules governing the sanitary maintenance of privy vaults in Philadelphia in 1915

Be Thankful You Don’t Live in Pre-Flush Philly