A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States ; an example of the nature of extinction at the boundary /
Wingard, G. Lynn
A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States ; an example of the nature of extinction at the boundary / by G. Lynn Wingard - Washington : U.S. Government Printing Office, 1993 - 131 p. : ill. ; 28 cm. - U.S. Geological Survey professional paper ; 1535 .
A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States ; an example of the nature of extinction at the boundary / by G. Lynn Wingard - Washington : U.S. Government Printing Office, 1993 - 131 p. : ill. ; 28 cm. - U.S. Geological Survey professional paper ; 1535 .