Watersheds Pennypack Creek Watershed

Map Lovers’ Monday: The Ellet Map of Philadelphia County, 1843

Sandy Run Watershed and the Holmesburg Water Works

Plans and maps of the Pennypack Creek Watershed in Philadelphia

Northeast Philadelphia history, one page at a time: The Holmesburg Library Scrapbook Collection

Norman Lofton inspects sewer at Ditman and Sheffield, 1987