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201Published 1930“...Timpanogos Cave National Monument (Utah) http://id.loc.gov/authorities/subjects/sh98000402...”
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202Published 2014“...Oregon Caves National Monument (Or.) http://id.loc.gov/authorities/subjects/sh85095438...”
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203Published 2006“...Mladec Caves (Czech Republic) http://id.loc.gov/authorities/subjects/sh2007000253...”
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204by Rothert, Otto A., 1871-1956“...Cave in Rock (Ill.) History....”
Published 1996
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205Published 1910“...Wind Cave National Park (S.D.) http://id.loc.gov/authorities/subjects/sh89002854...”
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206by Sullivan, Timothy J. (Timothy Joseph), 1950-“...Timpanogos Cave National Monument (Utah)...”
Published 2011
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207