American upper cretaceous echinoidea.

Bibliographic Details
Main Author:	Cooke, C. Wythe (Charles Wythe), 1887-1971
Format:	Government Document Book
Language:	English
Published:	Washington : U.S. Govt. Print. Off, 1953.
Series:	Professional paper (Geological Survey (U.S.)) ; 254-A. Shorter contributions to general geology.
Subjects:	Sea urchins, Fossil. Paleontology > United States. Paleontology > Guatemala. Paleontology > Cretaceous.