Maps with descriptions and commentary from the 17th through 20th centuries.

The Johns Hopkins University hosts this map collection of Pennsylvania.

Pennsylvania's official geospatial information clearinghouse and the Commonwealth's node on the National Spatial Data Infrastructure (NSDI).

Twelve maps from the 1700s, 1800s.

The Perry-Castañeda Library Map Collection.

"Surf Your Watershed"

Map includes interstate and U.S. highways plus major cities and towns.

Find maps of cities, crops, wind directions and other references.

Collection of State and major city area maps. Features detailed maps of Philadelphia, Pittsburgh, Harrisburg, Allentown and other major cities.