Lancaster, PA: The American Physical Society, 1937. Wraps. First Edition. 889-1005 pp. 4to. Green paper wraps that are quite clean. Ex-library with small black library stamp at lower right corner of front cover, no other markings. Very Good.
Nicholas Kemmer (1911-1999) was the first, in this paper, to propose a theory for the unification of the weak and electromagnetic interactions. His theory involved a charged carrier particle.