• publisher: Harrisburg, Pub. by the Board of Commissioners for the Second Geological Survey
  • creator: Pennsylvania. Geological Survey (2d, 1874-1890)
  • Keyword: Geology Pennsylvania. Coal Pennsylvania.
  • years: 1875-91.
  • pages: 109 v.
  • notes: 35 vols. are atlases.
  • download: pdf file