American Lignites: Geological Occurrence, Petrographic Composition and Extractable Waxes. By W.A. Selvig, W.H. Ode, B.C. Parks and H.J. O'Donnell
Geology and Mineral Resources of the Western Part of the Arkansas Coal Field, etc. [Reprinted from "Contributions to Economic Geology, 1934-36." With a map.].
Geology of the Fort Smith District of Arkansas ... A Description of the Stratigraphy, Structure, and Geomorphology. [With Diagrams.].
Proceedings of the 1997 International Oil Spill Conference; Improving Environmental Protection; Progress, Challenges, Responsibilities