Digital Bedrock Geologic-GIS Map of Herbert Hoover National Historic Site and Vicinity, Iowa (NPS, GRD, GRI, HEHO, HEHO_bedrock digital map) adapted from Iowa Geological and Water Survey Open-File Maps by Witzke, Anderson and Pope (2010), and Witzke and Anderson (2008) - heho_geology_gis_readme.pdf

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Name	heho_geology_gis_readme.pdf
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