Mercer, Henry C. The hill caves of Yucatan : A search fo evidence of man's antiquity in the caverns of Central America / Henry C. Mercer / intro. J.Eric S. Thompson - Norman, Oklahoma : University of Oklahoma Press , c1975. - 183p. : il. maps. retrs. ISBN: 0-8061-1310-3 Subjects--Topical Terms: Man--- Origin Subjects--Geographic Terms: Yucatan---Antiquities Dewey Class. No.: LAS 972.6 MER