数量9 v. in 6 : ill., maps ; 29 cm.
一般注記The nine pts. of this title are distributed within the six vols. (A-F) of Professional paper series no. 196 (see contents note) . Each vol. contains also the same foreward, by C. S. Piggot; the same general introduction, by W. H. Bradley; and the same summary.
Published by the Geological Survey also as one vol. in 1942.
書誌注記Includes bibliographical references and indexes.