Volume 20 - November
1958
Complete Issue
Article
Big Room Cave of Payne Cove
Cord H. Link Jr.
Article
A Statistical Theory of Cave Entrance Evolution
Rane L. Curl
Article
Brooding Slimy Salamanders, Plethodon glutinosus glutinosus (Green)
Patrick H. Wells and Willis Gordon
Article
A Peculiar Type of Cave Gypsum
Richard V. Dietrich and John W. Murray
Article
America's Deepest Cave
Dale J. Green and William R. Halliday
Article
Caves of Kwangsi
Robert E. Schworm
Article
Speleology in Czechoslovakia
Frantisek Skrivánek
Article
The Reservoir Theory of Spring Flow
Jerry Vineyard
Article
Caves of Yucatan and Guatemala
Arnold Meyers
Article
An Initial Survey of Caves of the Hawaiian Islands
William R. Halliday
Article
Use of Decamired Filters in Cave Photography
Howard N. Sloane
Index of Bulletins
One Through Twenty of the National Speleological Society
George F. Jackson
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