Equinoides del Cretacico Inferior de la region de San Juan Raya-Zapotitlan, Estado de Puebla.

Bibliographic Details
Main Author:	Buitrón, Blanca Estela
Format:	Book
Language:	Spanish
Published:	Mexico : Universidad Nacional Autonoma de Mexico, Instituto de Geologia, 1970.
Series:	Paleontología mexicana ; no. 30.
Subjects:	Sea urchins, Fossil. Paleontology > Cretaceous. Paleontology > Mexico > Tehuacan Region.

Description
Physical Description:	64 pages : map, 9 plates. ; 23 cm.
Bibliography:	Bibliography: pages [43]-45.