Travail incontournable pour tout sp l ologue ou explorateur de grottes, ce livre est un bulletin qui contient des articles scientifiques et de recherche sur la sp l ologie et l'hydrologie, ainsi que des rapports sur les exp ditions men es par la Soci t de Sp l ologie. Des cartes et des illustrations ajoutent une valeur suppl mentaire ce livre pr cieux et inspirant.
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