Lonely Planet: Philadelphia Map
Interactive map with links to information on attractions and points of interest.
www.lonelyplanet.com/mapshells/north_america/philadelphia/philadelphia.htm
Historic Pittsburgh Maps Collection
Representative selection of plat maps which were published by the G. M. Hopkins Company and cover the greater Pittsburgh area through the years of 1872 to 1939.
digital.library.pitt.edu/maps
Pennsylvania Maps
Collection of state, city, and historical maps from the Perry-Castaneda Library Map Collection.
www.lib.utexas.edu/maps/pennsylvania.html
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