Sheafer, A. W., & Ashburner, C. A. (1885). The township geology of Elk and Forest counties. Board of Commissioners for the Second Geological Survey of Pennsylvania.
Chicago Style (17th ed.) CitationSheafer, Arthur W., and Charles A. Ashburner. The Township Geology of Elk and Forest Counties. Harrisburg: Board of Commissioners for the Second Geological Survey of Pennsylvania, 1885.
MLA (9th ed.) CitationSheafer, Arthur W., and Charles A. Ashburner. The Township Geology of Elk and Forest Counties. Board of Commissioners for the Second Geological Survey of Pennsylvania, 1885.
Warning: These citations may not always be 100% accurate.