Cardiac and vascular disorders. Differential diagnosis by new physiological techniques: By Prof. Dr. Rudolf Volker, University of Göttingen, Göttingen, Germany; with Prof. R. Schoen and Karlman Wasserman. Translated by Henry Mayer, M.D., Stanford University Medical School, Palo Alto, Calif. Second edition, Springfield, Ill., 1965, Charles C Thomas, 236 pages. Price $11.50