Association for Mexican Cave Studies bulletin, Vol. 2, 1968
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AMCS bulletin, Vol. 2/ Edited by Terry W. Raines , Photographs by Terry W. Raines and Bill Deane, 1967 (PDF reprint made 2011). The original edition of this publication consisted of a twenty-page bound booklet and eight large color photographs in an envelope, plus a very large, loose, folded map of the cave. This bulletin is largely superseded by Bulletin 10, Caves of the Golondrinas Area, but it is of historical interest, especially the photographs. The PDF contains scans of all of these in one file. Open Access - Permission by Publisher See Extended description for more information.
"Sótano de las Golondrinas Association for Mexican Cave Studies bulletin, Vol. 2, 1968" (1968). KIP Articles. 5166.