Pittsburgh Geological Society
- Organization of professionals and amateurs. Includes meeting schedule, maps and publications on regional geology, geohazards, and other topics, issue statements, job postings, and other resources.
- http://pittsburghgeologicalsociety.org/

Pennsylvania Council of Professional Geologists
- Serve the professional and commercial interests of member firms that provide or utilize geological services.
- http://www.pcpg.org/

A Geological Hand Atlas of the Sixty-Seven Counties of Pennsylvania
- Electronic version of an 1885 report. Includes descriptions and geologic maps for each county.
- http://www.libraries.psu.edu/emsl/guides/X.html