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 / by Henry C. Mercer.

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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 / by Henry C. Mercer. Public Domain Mark. Source: Wellcome Collection.