Bedrock geologic map of the Ishpeming quadrangle, Marquette County, Michigan
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Geologic Quadrangle↗
Geology topics
George Clarke Simmons
Publications and source records attributed to George Clarke Simmons.
Mineral resources of the Cougar Lakes-Mount Aix study area, Yakima and Lewis counties, Washington
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Open-File Report↗
Otter Creek coral bed and its fauna, east-central Kentucky
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Bulletin↗
Geologic map of the Richmond North quadrangle, Madison and Fayette Counties, Kentucky
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Geologic Quadrangle↗
Geologic map of the Union City quadrangle, Madison and Clark Counties, Kentucky
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Geologic Quadrangle↗
Geologic map of the Clay City quadrangle, Powell and Estill Counties, Kentucky
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Geologic Quadrangle↗