The Hill-Caves of Yucatan: A Search for Evidence of Man’s Antiquity in the Caverns of Central America: Being an Account of the Corwith Expedition of the Department of Archaeology and Palaeontology of the University of Pennsylvania (Philadelphia: J. B. Lippincott Co., 1896), by Henry C. Mercer (page images at HathiTrust)
from New Online Books https://catalog.hathitrust.org/Record/009774501
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