Occurrence and stratigraphic distribution of Paleozoic ostracodes, by Chalmer L. Cooper. Printed by authority of the state of Illinois.

At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education, Frank G. Thompson, Director. Division of the State Geological Survey, M. M. Leighton, Chief, Urbana.

"Reprinted from the Journal of Paleontology, vol. 16, no. 6, November, 1942."

"Presented at the conference of the Research Committee on Sedimentation, at the 27th Annual meeting of the American Association of Petroleum Geologists, Denver, April 21, 1942."--p. 764.

References: p. 773, 776.