UIS Commission on Karst Hydrogeology and Speleogenesis
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Karstbase Bibliography Database

Perry,Clay
Outdoors from top to bottom
NSS Bulletin
1941
3
1
5
7
1469517
outdoors-from-bottom_sekaID-3760
Perry,Clay, 1941, Outdoors from top to bottom , NSS Bulletin , 3 , 5 - 7 http://www.caves.org/