Bulletin of the National Speleological Society - ISSN 0146-9517
Number 16: 91-93 - December 1954
A publication of the National Speleological Society
Donald N. Cournoyer
The development of specialized equipment for speleological investigations is a field that is much in need of additional study. One such piece of equipment is here described in the hope that its use may be adapted to similar investigations.
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