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Report of progress in the Beaver River District of the bituminous coal-fields of western Pennsylvania
- "Geological Survey of Pennsylvania : 1875"@en
- "Geological Survey of Pennsylvania : 1875"
- "Report of progress in the Beaver River District of the bituminous coal-fields of western Pennsylvania"@en
- "Report of progress in the Beaver River District of the bituminous coal-fields of western Pennsylvania"
- "Report of progress in the Beaver river district of the bituminous coal-fields of Western Pennsylvania"
- "Report of Progress in the Beaver River District of the Bituminous Coal-Fields of Western Pennsylvania. ... Illustrated, etc"
- "Report of Progress in the Beaver River District of the Bituminous Coal-Fields of Western Pennsylvania. ... Illustrated, etc"@en