• publisher: Pub. by the Board of commissioners for the Second geological survey
  • creator: Andrew Sherwood , Franklin Platt , Charles Albert Ashburner
  • contributor: University of Michigan
  • mediatype: texts
  • years: 1880
  • pages: 149
  • language: English
  • notes: At head of title: Second Geological Survey of Pennsylvania: Report of progress in 1876-79. GGG.
  • download: pdf file