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pennsylvania state geologist 1874 1890
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Pennsylvania. State Geologist (1874-1890) · Board of Commissioners for the Geological Survey
Sayfa sayısı yok · 1892
Coal / Stratigraphic Geology / Geology
Pennsylvania State Geologist (1874-1890 )., Geological Survey of Pennsylvania, Pennsylvania Board of Commissioners for the Second Geological Survey · Board of Commissionersfor the SecondGeological Survey
Sayfa sayısı yok · 1884
Kategori yok
Pennsylvania. State Geologist (1874-1890) · Board of Commissioners for the Geological Survey
28 sayfa · 1892
Kategori yok
Pennsylvania. State Geologist (1874-1890) · Board of Commissioners for the Second Geological Survey
271 sayfa · 1878
Geology -- Pennsylvania -- Bradford County. / Geology -- Pennsylvania -- Tioga County. / Coal -- Pennsylvania.
Pennsylvania. State Geologist (1874-1890) · State Printer
Sayfa sayısı yok · 1884
Geology -- Pennsylvania -- Maps
Pennsylvania. State Geologist (1874-1890) · Yayınevi bilinmiyor
62 sayfa · 1885
Geology -- Pennsylvania -- Maps
Pennsylvania. State Geologist (1874-1890) · Sine nomine
14 sayfa · 1885
Geology -- Pennsylvania -- Bibliography.
William A. Ingham, Pennsylvania. State Geologist (1874-1890) · C. M. Busch
Sayfa sayısı yok · 1896
Geology / Bibliography