Bibliography

List of publications where caves and artificial cavities are cited.

Dans les abîmes de la terre 
Authors: Michel Siffre
Country: Germania
Year: 1975
Username: michelangelochesta
Updated by: michelangelochesta
Update date: 08/02/2021 16:56:06
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La Terre du Visconte 
Authors: Thierry Fighiera
Country: Francia
City: Mayenne
Year: 2011
Username: michelangelochesta
Updated by: michelangelochesta
Update date: 03/02/2021 21:13:56
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