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.
Niels Bohr (1884-1962) first gives a name to the correspondence principle (“Korrespondenzprincip”) in a presentation to the Berlin Physical Society in 1920. The correspondence principle "says that for large orbits and for large energies, quantum calculations must agree with classical calculations." (https://en.wikipedia.org/wiki/Correspondence_principle)
Also contains Otto Stern's article, “Eine direkte messung der thermischen molekulargeshwinidigkeit” (“Direct measurement for the thermal molecular velocity”) on pp. 49-56.