caves.org: The National Speleological Society
The National Speleological Society is a not for profit organization dedicated to the study, conservation, exploration and knowledge of caves.
uis-speleo.org: International Union Of Speleology - Uis
The Union Internationale de Spéléologie (UIS) is the international body for caving and speleology. Formed in 1965, its voting members consist of a delegate from each ...
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