Number 20 - November 1958

Cover

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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