Physics of the electron shells Senior author: Hans Kopfermann; co-authors: W. Finkelnburg, H. Kulenkampf, Th. Förster, M. v. Laue, J. Goubeau, K. Schäfer, H. Hoyer, H. A. Stuart. Translated, edited, and published, in cooperation with the Office of Technical Services, Dept. of Commerce, United States Government, by the O. W. Leibiger Research Laboratories, inc. Chief translator: I. S. Leibiger; chief editor: O. W. Leibiger