Published by The American Naturalist, Vol. XCII, No. 866, September-October 1958, pp. 313-319, 1958
Pamphlet. Condition: Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. Ownership Stamp Hampton L. Carson on front cover. First edition. Offprint. Original wrappers.* Science. Genetics.