Zustand: very good. from the abstract, "Certain gross aspects of the different lead-zinc-barite-fluorspar deposits of this type in North America provide compelling guidelines that must be followed in determining the most likely mode of origin for the deposits." softcover, 9.5' x 6.75", 6 pages, stamped with compliments from author and signed by author on cover Reprinted from Economic Geology Monograph 3, 1967. Signed.