Published by Reprinted from the Proceedings of the National Academy of Sciences, Vol. 20, No. 8, pp. 495-501. September, 1934, 1934
Pamphlet. Condition: Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. Staple binding, previous owner wrote on upper right hand side, Reprinted from the Proceedings of the National Academy of Sciences, Vol. 20, No. 8, pp. 495-501. September, 1934.