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The Validity on Tour Development of Yoryang Coral Cave.
Hong, Si-Hwan, Won, Pyong-Kwan The Speleological Society 1997 p.5-14
A Study on the Environmental Change and Cause of the Cave
Hong, Hyon-Chol, Lee, Sung-Ho,Won, Pyong-Kwan The Speleological Society 1997 p.15-24
SPELEOLOGICAL POTENTIAL OF KAMCHATKA OBLAST
Ha, William R.lliday The Speleological Society 1997 p.53-55
Notes on the Volcanic of S. Miguel Island
Nnnes, J.C., Braga, T.,Constancia, J.P. The Speleological Society 1997 p.66-69
Recent Discovery of secondary Mineral Deposit in an Idaho Lava Tube
Kesner, David W. The Speleological Society 1997 p.70-78
Application of computers to Cave Surveying
Bennett, A.J. The Speleological Society 1997 p.96-106