Lancaster, PA: The American Physical Society, 1950. Wraps. First Edition. 549-746 pp. 4to. Green paper wraps that are quite clean inside and out. Very Good.
Early report by Willis E. Lamb, Jr. (1913-2008) on what became know as the Lamb Shift and for which Lamb shared the Nobel Prize for Physics in 1955.
Issue also contains Karl-Otto Kiepenheuer's artcile, “Cosmic Rays as the Source of General Galactic Radio Emission” (Physical Review; Volume 79 No. 4, pp. 738-739).