Lancaster, PA: The American Physical Society, 1937. Wraps. First Edition. 43-142 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.
Bloch and Nordseic point out that the theory of Quantum Electrodynamics (QED) was only accurate to the first level of perturbation theory, indicating a problem with the theory.