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1:29
ecología de cuevas
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1:11
uso de cuevas
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2:25
geología e hidrología
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USDA Forest Service Prince William Network Cave Research Foundation Cave Conservancy of the Virginias Cave Conservancy Foundation National Caves Association National Park Service Indiana Karst Conservancy US Geological Survey National Cave & Karst Program, United States Forest Service U.S. Fish and Wildlife Service Društvo za raziskovanje jam Ljubljana Luray Caverns Crawford Hydrology Laboratory Under Earth Images Project Underground Natural Inquirer National Speleological Society FSNatureLIVE: Distance Learning Adventures National Cave and Karst Research Institute