London, Macmillan & Co, 1966. Royal8vo. Bound in contemporary full cloth. In ""Nature"", Vol. 211, 1966. Bookplate to front free end-paper and library stamp to title page. A very fine and clean copy. pp. 676-81. [Entire volume: LV, (1), 1432 pp.].
First printing of Wilson's seminal paper in which he argues the possibility of continental drift before the break up of the once supercontinent Pangea."" ""it was the very first time the new plate tectonics had been extended back to the pre-Pangaean Earth"". (Nield, Supercontinent). The paper is wide considered one of the most important ever to be published in Nature.