Association of Cavers of the Hogant Region (HRH) - - Founded in 1979. Coordinates exploration and scientific research, exchanges data and information, and promotes conservation. Includes contacts. [German, French and English].
Hoelloch Cave Research Association - - Dedicated to the exploration and survey of the karst area of the Muotha Valley. Includes history of the Hoelloch system, photo gallery, literature and contact information.
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