TY  - BOOK
AU  - Speden,Ian G.
AU  - Speden,I.G.
TI  - The type Fox Hills Formation, Cretaceous (Maestrichtian), South Dakota: Ian G. Speden
PY  - 1970///
CY  - New Haven
PB  - Yale University
N1  - Part. 2 Systematics of the Bivalvia
ER  -