Published by Addison-Wesley Publishing Company, Readin, Massachusetts, 1963. Prepared under the direction of a Committee of the Geological Society of America, in commemoration of the Society's 75th Anniversary. Light green cloth covers, with a protective paper cover. White lettering, 372 pages, very clean, no markings on pages except for previous owner's signature on front end page, corners have little wear, strong binding. A great used book!