[1]
Plummer, N.D. and Romary, J.F. 1942. Stratigraphy of the Pre-Greenhorn Cretaceous Beds of Kansas.
Bulletin (Kansas Geological Survey)
. 41 (Jan. 1942), 315–348. DOI:
https://doi.org/10.17161/kgsbulletin.no.41.21927
.