How it works : the illustrated encyclopedia of science and technology / edited by Ralph Hancock...[et al.]. - New york : Marshall Cavendish, c 1977. - Vols. : ill. ; 28 cm. V. 8- Fibre optics-gauss 47 47 ISBN: 0 85685 210 4 Subjects--Topical Terms: Dictionaries & encyclopedias. Dewey Class. No.: 503 / I6