Editore: Smithsonian Institution Press, Washington, D. C., 1970
Da: Willis Monie-Books, ABAA, Cooperstown, NY, U.S.A.
softcover. Condizione: Very Good. Condizione sovraccoperta: No Dust Jacket. Smithsonian Contributions to the Earth Sciences 1970 Number 4. Label residue on front cover, address label on title page.
Editore: Woods Hole Oceanographic Institution., 1971
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft cover. Condizione: Good. ORIGINAL 1971 PUBLICATION; softcovers; ex-library; light creasing of edges of covers; small foxing spots on endpages and edges; o/w contents in very good condition. Journal.