Braunschweig, Germany: Friedr. Vieweg & Son, 1920. Hardcover. First Edition. iv, 478 pp. 8vo. Gray cloth spine with gray patterned cloth covers. Some scuffing overall with a clean interior. Previous owner's name in ink on first free endpaper. Very Good.
Otto Stern's (1888-1969) article, “Eine direkte messung der thermischen molekulargeshwinidigkeit” (“Direct measurement for the thermal molecular velocity”).
Also contains Niels Bohr's (1884-1962) article that first gave a name to the correspondence principle.