TY  - BOOK
TI  - Illustrated science and invention encyclopedia :  how it works vol . 8
U1  - 603.21 
PY  - 1976///
CY  - New York
PB  - H.S.Stuttman
KW  - Encyclopedia
KW  - Science
KW  - Technology
N1  - Fibre optics guases, carl, fredrich
ER  -