At head of title, no. 1-3: Bulletin of the University of Kansas, v. 33, no. 10; v. 34, no. 5.
No. 4 has title stamped on cover.
Nos. 1-3 reprinted from the University of Kansas science bulletin, vol. XX, no. 20-21; vol. XXI, no. 9; no. 4 from Journal of geology, vol. XLIV, no. 1.