The Pennsylvanian formations of southeastern Nebraska - Condra, Geo. E. (George Evert), 1869-1958.; Bengtson, N. A. (Nels August), 1879- ([Lincoln?], 1915)
At head of title: Nebraska physical and social science series.
Forms Bulletin no. [2] of the Nebraska conservation and soil survey of the University of Nebraska.
Keywords: Geology -- Nebraska