Maryland Geological Survey Garrett County
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Geology and mineral resources of southern Maryland, (Maryland Geological Survey. Report of investigations, no. 15)
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The Piedmont crystalline rocks at Bear Island, Potomac River, Maryland (Guidebook--Maryland Geological Survey)
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Maryland Geological Survey Baltimore County
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Geography and Geology of Maryland; Maryland Geological Survey Bulletin 19
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Geological Survey of Alabama Bulletin 112: Caves of Morgan County, Alabama, 1980
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UNITED STATES GEOLOGICAL SURVEY USGS T-Shirt
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Folios of the Geologic Atlas of the United States : St. Mary's, Maryland - Virginia, 1906, Folios of the Geologic Atlas of the United States, Number 136 : 7 pages and 2 maps.
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1911 Map Michigan|upper peninsula|of the surface formations Northern Peninsula Geological Survey|Land capability for agriculture|Historic Antique Vintage Reprint|Ready to Frame
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The Geology of Pennsylvania
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