TY  - BOOK
AU  - Welford, WT
AU  - Wald, RM
TI  - Useful optics
SN  - 9780226893068
U1  - 535 
PY  - 1991///
CY  - Chicago
PB  - Chicago
KW  - OPTICS
N1  - The series is  edited by Robert M. Wald
ER  -