http://tags.library.upenn.edu/tag/river+sewerage+creek+delaware_valley PennTags Feed http://tags.library.upenn.edu/makerecord/url/40961 http://tags.library.upenn.edu/makerecord/url/40961 <p>Maps pertaining to surface water (historically and currently) in Philadelphia, and the city's water supply and sewerage systems.&nbsp; The site also provides links to many scanned, old atlases, topographical maps, etc. for Philadelphia (including some complete atlas volumes), nearby communities, and counties in southeastern Pennsylvania.</p>