Equinoides del Cretácico Inferior de la región de San Juan Raya-Zapotitlán, Estado de Puebla.
Series: Paleontología mexicana, no. 30
Publisher: Universidad Nacional Autónoma de México, Instituto de Geología
Published: 1970
Place of publication: México
Language: spa
Number of pages: 64
Subjects: Sea urchins, Fossil -- Mexico -- Tehuacán River Region.; Paleontology -- Cretaceous.; Paleontology -- Mexico -- Tehuacán River Region.
Notes: Bibliography: p. [43]-45.