Published by The University of Chicago, 1939
Soft cover. Condition: Very Good. ORIGINAL 1939 Reprint/Offprint of Journal Article; softcovers; light browning of leaves; o/w in very good condition. Journal.
Published by J Geol, 1939
Magazine / Periodical
Pamphlet. Condition: Very Good. Vol 47, No 6, pp. 598-612, Photos, Extracted from orig vol, thus begins with title page, trimmed & stapled pamphlet, else VG.