Opera Ipogea Journal of Speleology in Artificial Cavities
Rivista della Società Speleologica Italiana
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Speleology in artificial cavities
Origini della Speleologia in Cavità Artificiali
La Commissione Nazionale Cavità Artificiali SSI
Classification of artificial cavities
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Società Speleologica Italiana
Catasto Nazionale delle Cavità Artificiali
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operaipogea
| on Gennaio 21, 2016
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