"The geology of Pennsylvania : a government survey"@en
"The geology of Pennsylvania a government survey: with a general view of the geology of the United States, essays on coal-formation and its fossils, and a description of the coal-fields of North America and Great Britain"@en
"The geology of Pennsylvania ; a government survey with a general view of the geology of the United States, essays on coal-formation and its fossils, and a description of the coalfields on North America and Great Britain"@en
"The geology of Pennsylvania a government survey"@en
"The geology of Pennsylvania; a government survey: with a general view of the geology of the United States, essays on coal-formation and its fossils, and a description of the coal-fields of North America and Great Britain"
"The geology of Pennsylvania; a government survey: with a general view of the geology of the United States, essays on coal-formation and its fossils, and a description of the coal-fields of North America and Great Britain"@en
"The geology of Pennsylvania; a government survey"
Geological Survey of Pennsylvania. State geologist
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Pennsylvania. Bureau of Topographic and Geologic Survey.
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