Illustrations of plant microfossils from the Yazoo Clay (Jackson Group, upper Eocene) Mississippi /
by Robert H. Tschudy and Sharon D. Van Loenen
- Washington, D.C. : United States Geological Survey, 1970
- iii, 5, [12] p. : ill., map. ; 29 cm.
- Geological Survey professional paper ; 643-E Contributions to paleontology .