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.
Pennsylvania Council of Professional Geologists: Serve the professional and commercial interests of member firms that provide or utilize geological services.
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.