Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1970. Softcover. Item #42957
A description of a late Miocene nonmarine diatom asseblage from the Great Plains region and its stratigraphic and paleoecologic significance. 24 pages with map, index and references, plus three plates bound in the rear. Bound in thick gray paper covers printed in black. From the library of paleontologist David L. Durham with his stamp on the front cover. A fine copy.