Audio-visual aids to instruction / by Harry C. McKown...and Alvin B. Roberts... McKown, Harry C. (Harry Charles), 1892-1963. Roberts, Alvin B., joint author. Audio-visual education. LB1043 .M3 1940 371.33 MCA "Selected references" at end of each chapter except chapter III. "Sources of materials and equipment": p. 365-375. New York : McGraw-Hill book company, inc., 1940. 1940. 1940 Text xiv, 385 p. : eng McGraw-Hill series in education, Harold Benjamin, consulting editor.