Subjects Natural Environment

Thomas Mill Covered Bridge on the Wissahickon

Thomas Mill Covered Bridge over Wissahickon Creek (Picturesque America)

Black-and-white aerial photo of a creek bend with industrial buildings surrounding it

The Sad History of Frankford Creek

Black-and-white image of workers in a pit with a sewer opening behind them and text

Frankford Creek: Sad History of an Urban Stream title page

Image shows a black-and-white drawing of a creek with dotted lines indicating where changes will be made

“A Snake That Will Be Straightened Out,” map of Frankford Creek with proposed changes, 1949