Harry Callahan and John Szarkowski. Callahan. New York: Aperture, 1976. First edition. With Bill Wittliff ink ownership stamp and signature.   Quarto. 202pp. Fully illustrated with b/w photos by Harry Callahan. Publisher's black cloth, spine and front cover lettered in green, original unclipped dust jacket.  From the collection of Bill Wittliff, highly regarded book designer, typographer.....