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Coal, Iron, and Oil
None
Report of Progress 1874-1889. The Geology of Clarion County
Reprint of the original, first published in 1880.
Report of Progress 1874-1889, A-Z.
35 vols. are atlases.
Report of Progress in Amstrong County
Reprint of the original, first published in 1880.
The Geology of the Oil Regions of Warren, Venango, Clarion, and Butler Counties, Including Surveys of the Garland and Panama Conglomerates
Reprint of the original, first published in 1880.
