Washington DC: United States Government Printing Office, 1981.
Softcover. Very Good. 9 pp (A1-A9), with illustrations, tables, in original wrappers with stapled binding. Light creasing and handling wear; offsetting from label on front cover. Geological Survey Professional Paper 1170-A. "A petrologic and structural study of a large ultramafic body in the Yukon-Tanana Upland."