The cretaceous formations of northeastern Colorado and the foothills formations of north-central Colorado - Henderson, Junius, 1865-1937. (Denver, Col., Eames brothers, state printers, 1920)
At head of title: Colorado Geological survey, Boulder ...
Bibliography: p. 53-57, 94-96.
Bibliographical foot-notes.
Keywords: Geology -- Colorado; Geology, Stratigraphic -- Cretaceous