Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1975. Soft cover. Item #46725
Eleven microfossil assemblage zones are recognized in two sections of Carboniferous rocks in the northeastern Brooks Range, correlated with six other previously described sections, and tied to the Cordilleran and Eurasian standards. 29 pages with maps, tables, photomicrographs, references and index. Bound in original gray stiff paper covers with printing in black. A near fine copy.