[1]
D. E. Hattin and D. A. Darko, “Technique for Determining Coccolith Abundance in Shaly Chalk of Greenhorn Limestone (Upper Cretaceous) of Kansas”, kgsbulletin, no. 202, pp. 1–11, Jan. 1971, doi: 10.17161/kgsbulletin.no.i202.22247.