Verlag: Ohio Geological Survey., 1959
Anbieter: Eryops Books, Stephenville, TX, USA
Soft cover. Zustand: Very Good. ORIGINAL PUBLICATION; softcovers; ex-corporate library; in very good condition. Book.
Verlag: Ohio Division of Geological Survey, Columbus, Ohio, 1957
Zustand: very good. Report of Investigations NO. 34 "The Conemaugh formation underlies approximately 8,000 square miles of eastern Ohio. This formation contains at least 18 coal horizons, of which only 6 seams occur with any degree of persistency; even these 6 seams are extremely erratic and vary in thickness and quality within short distances." DH1. softcover, stamp front cover, 11" Tall, stapled binding, binding very good, pages clean, illustrated, 33 pages.