Пенсильвания
Pennsylvania Geological Survey:
http://www.dcnr.state.pa.us/topogeo/
Pennsylvania Geological Survey: Oil and Gas Resources
http://www.dcnr.state.pa.us/topogeo/oilandgas/resrefs.aspx

Эдвин Дрейк
27 августа 1858 года на глубине 69,5 футов (21 м) получена нефть.

http://www.dcnr.state.pa.us/topogeo/pub/v29n1.pdf

Edwin L. Drake
http://www.portal.state.pa.us/portal/server.pt?open=512&objID=4277&&PageID=443544&level=4&css=L4&mode=2


http://www.dcnr.state.pa.us/topogeo/education/es8.pdf





http://www.dcnr.state.pa.us/topogeo/maps/map10.pdf


http://geology.com/state-map/pennsylvania.shtml

Physiographic Provinces of Pennsylvania




http://www.dcnr.state.pa.us/topogeo/map13/map13.aspx
http://www.dcnr.state.pa.us/topogeo/maps/map13f.pdf

A Short Explanation of the Geological Structure of Pennsylvania
http://www.libraries.psu.edu/psul/emsl/PaResources/atlasexplanation.html
Geologic Maps of Pennsylvania Counties
http://www.libraries.psu.edu/psul/emsl/PaResources/pacounty.html

1950's - 1990's Pennsylvania Maps
http://www.mapsofpa.com/modernmaps9.htm

Геологические карты
Geologic Map of Pennsylvania, New Jersey, Maryland and Delaware





http://www.uwgb.edu/DutchS/StateGeolMaps/PaNJGMap.HTM





http://www.delminsociety.net/motm/motm_feb2007.shtml
http://www.dcnr.state.pa.us/topogeo/maps/map7.pdf


Basement Depth and Related Geospatial Database for Pennsylvania