Map Lovers’ Monday: The David Rumsey Map Collection
Map Lovers’ Monday: New Jersey 1869
Map Lovers’ Monday: Topography of Philadelphia from 1863
Dock Creek Sewer in 1849: A report on its condition made to City Councils
High Water: Flooding in Philadelphia
From Creek To Sewer
Watersheds: Learning to care for and protect our local water resources
Streams, islands, and ferries of early Philadelphia
Exploring the Lenapehoking Watershed on Native American Heritage Day
Penn’s Treaty with the Indians (Watson’s Annals)