Washington: United States Government Printing Office, 1987. softcover, 11" x 8.5", illustrated, 47 pages, library writings on cover, cover loose from pages. from the abstract, "Dominantly explosive mid-Oligocene magmatic activity 33-28 m.y. ago along the southern Utah-Nevada border produced several ash-flow cooling units with a total volume of at least..... More

Washington: United States Government Printing Office, 1988. softcover, 11" x 8.5", two folded sheets inside rear pocket, 37 pages, illustrated. from the introduction, "The chief purpose of this report is to tabulate previously unpublished mineralogical and chemical data for a comagmatic group of over 40 middle Pleistocene volcanic ash beds..... More

Washington, D. C. U. S. G. P. O., 1981. First Edition. Paperback. Unmarked internally. Cover contains company stamp and catalog sticker plus spine is reinforced with clear tape. 2 folded plates in rear pocket. ; Book Description; Spine has no signs of creasing. Pages are clean and not marred by..... More