The American Fiat Review of German Science 1930-1946: Physics of the Electron Shells (Vol. 12.) By Hans Kopfermann, Lithoprinted By the M. H. Davidson Company, New Haven, Connecticut, 1950.
 
Physics of the Electron Shells

Nice cover with lite shelf wear (mild surface scratch to front bottom board), and a solid binding with clear unmarked text pages. About 8-1/2 x 5-1/2 with 171 pp. Very rare and in great condition!