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The township geology of Elk and Forest Counties
- "The township geology of Elk and Forest Counties : And of Cameron County"
- "The township geology of Elk and Forest Counties"@en
- "The Township geology of Elk and forest counties, by Charles A. Ashburner, and of Cameron County by Arthur W. Sheafer"
- "The township geology of Elk and Forest counties"@en
- "The township geology of Elk and Forest counties"
- "The township geology of Elk and Forest counties and of Cameron County related especially to the geology of the coal measures of the Carboniferous Age"@en
- "The township geology of Elk and Forest Counties/ [Text]"
- "The township geology of Elk and Forest counties and of Cameron County : related especially to the geology of the coal measures of the Carboniferous Age"@en
- "The Township Geology of Elk and Forest Counties"
- "The township geology of Elk and Forest Counties and of Cameron County"