Photoelectricity and its application / by V.K. Zworykin and E.G. Ramberg. Zworykin, V. K. (Vladimir Kosma), 1889-1982. Ramberg, E. G. (Edward Granville), 1907-1995. joint author. Photoelectric cells. QC715 .Z8 1949 537.5 ZWP . Includes bibliographical references and index. New York : J. Wiley, 1949. 1949. 1949 Text xii, 494 p. : eng