diumenge, 5 de gener del 2014

Pins Espeleologia (U.S.A.)

 CAVE OF THE WINDS

 CARLSBAD CAVERNS




 (1992) NSS CONVENTION. SALEM, INDIANA

 CAVING IN RUSSIA

 (1981) 8TH CIS - USA

 NSS VERTICAL SECTION

 (1957) CAVE RESEARCH FOUNDATION

 (1988) DISCOVER THE GOLD. HOT SPRINGS, DAKOTA

(1989) NATIONAL SPELEOLOGICAL SOCIETY 1939-1989

 (1991) NATIONAL SPELEOLOGICAL SOCIETY 1941-1991


 NATIONAL SPELEOLOGICAL SOCIETY

 NATURAL BRIDGE CAVERNS



(1991) ONE WORLD UNDERGROUND. URRS - USA

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