London: Macmillan, 1928.
First edition of Niels Bohr's paper, "The Quantum Postulate and Atomic Theory," as published in Nature, vol. 121, no. 3050, pp. 561-608, April 14, 1928, the entire issue offered here, with Bohr's paper on pp. 580-590. Some soiling to covers, light creasing, ink stamp on front cover, a very good copy. Pages 581-588 are loose from binding. Rare in the original wrappers. Item #140940043