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Subterranea (geography)
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Subterranea are underground structures, both natural (such as caves) and human-made (such as mines).[1]
Some subterranea and related topics include:
- ^ Margineanu, Romul Mircea (2019). "Radon measurements in underground mines and caves from several European countries". AIP Conference Proceedings. 2076. Author(s): 050004. doi:10.1063/1.5091643.
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