The type Fox Hills Formation, Cretaceous (Maestrichtian), South Dakota / Ian G. Speden.
Speden, Ian G.
The type Fox Hills Formation, Cretaceous (Maestrichtian), South Dakota / Ian G. Speden. - New Haven : Yale University, 1970. - 222 p. : illus. (part fold.), maps (part fold.) ; 26 cm. - Bulletin, 33 0079-032X ; .
Part. 2 Systematics of the Bivalvia.
The type Fox Hills Formation, Cretaceous (Maestrichtian), South Dakota / Ian G. Speden. - New Haven : Yale University, 1970. - 222 p. : illus. (part fold.), maps (part fold.) ; 26 cm. - Bulletin, 33 0079-032X ; .
Part. 2 Systematics of the Bivalvia.