1. Comparative biologic‐anatomical researches on mastication in some mammals;Becht G.;Proc. Kon. Nederl. Akad. Wetensch., (C),1953
2. Potassium-argon dates and the Cenozoic mammalian chronology of North America
3. American Hyracotherium (Perissodactyla, Equidae);Kitts D.;Bull. Amer. Mus. Nat. Hist.,1956
4. A revision of the Puerco fauna;Matthew W. D.;Amer. Mus. Nat. Hist. Bull.,1897
5. Titanotheres of ancient Wyoming, Dakota, and Nebraska;Osborn H. F.;U.S. Geol. Surv. Monograph,1929