HEISENBERG, WERNER. Die Physikalischen Prinzipien der Quantentheorie. Leipzig: Hirzel, 1930. One photographic plate. 8vo, original printed wrappers, minor splitting to spine, light marginal staining. FIRST GERMAN EDITION. Based on Heisenberg's lectures, held at the University of Chicago in Spring 1929. Poggendorf VI:1069.