Plan of Philadelphia, John Hills, 1796
Frankford Creek Watershed: A historical overview of the Philadelphia section
Frankford Creek Watershed Historical Timeline
Drawing Dock Creek
Overbrook, as it was. A brief history of the Overbrook neighborhood of Philadelphia, focusing on changes in the natural landscape.
A Tour of Philadelphia’s Delaware River Waterfront in 1876
Cobbs Creek: A Brief Historical Overview by Adam Levine
Glossary of Drainage Terms by C. Drew Brown
Centre Square Water Works, Drawings of Intake Basin
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799