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Now showing items 31-40 of 11
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Devonian - Catskill formation; Jennings formation; Romney shale; Oriskany sandstone; Helderberg limestone (1)
Devonian - Chemung formation; Oriskany formation (1)
Devonian - Jefferson limestone (1)
Geology -- Arizona -- Maricopa County -- Maps (1)
Geology -- Arizona -- Yavapai County -- Maps (1)
Geology -- Pennsylvania -- Franklin County -- Maps (1)
Geology -- Pennsylvania -- Fulton County -- Maps (1)
Geology -- South Dakota -- Lawrence County -- Maps (1)
Geology -- South Dakota -- Maps (1)
Geology -- South Dakota -- Pennington County -- Maps (1)
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