Unit Title	Author	Year
Seminar: Philadelphia: A 300-Year History
The Disappearance of Sherwood Forest: The History of Cobbs Creek in Philadelphia	Patricia Blakeney-Whack	2006
Keywords: Cobbs Creek Parkway, Ecology, Environmental Science, pollution, Preserving the Environment, Watershed, West Philadelphia
Seminar: Topics in Environmental Health
Where Does Our Water Come From?	David White	2021
Keywords: water, water cycle, water filtration, water pollution, Watershed