Harbottle, Horace Reginald. The principles of telecommunications engineering, by H. R. Harbottle and B. L. G. Hanman. - London, English Universities Press, [1957- - v. illus. 21 cm. - General technical series . LCCN: 57046826 Nat. Bib. No.: GB57-12000 Subjects--Topical Terms: Telecommunication. LC Class. No.: TK5101 / .H287 Dewey Class. No.: