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robert g piotrowski
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Oil and gas developments in Pennsylvania in 1978 / by Robert G. Piotrowski ... [et al.].
Robert G. Piotrowski · Pennsylvania, Bureau of Topographic and Geologic Survey
68 sayfa · 1979
Natural gas -- Pennsylvania
Oil and gas developments in Pennsylvania in 1979 / compiled by Robert G. Piotrowski.
Robert G. Piotrowski · Pennsylvania, Bureau of Topographic and Geologic Survey
70 sayfa · 1980
Petroleum -- Pennsylvania
Geology and natural gas production of the Lower Silurian Medina group and equivalent rock units in Pennsylvania
Robert G. Piotrowski · Commonwealth of Pennsylvania, Dept. of Environmental Resources, Office of Resources Management, Bureau of Topographic and Geologic Survey
21 sayfa · 1981
Geology / Natural gas / Sedimentary Rocks / Sedimentary rocks