Crowhurst, Norman H. Basic audio systems, by Norman H. Crowhurst. - [1st ed.] - Blue Ridge Summit, Pa., G/L Tab Books [1973] - 240 p. illus. 23 cm. ISBN: 083063634X LCCN: 72097210 Subjects--Topical Terms: Sound--Recording and reproducing. LC Class. No.: TK7881.4 / .C76 Dewey Class. No.: 621.389/3