000 00239nam a22001097a 4500
082 _a681.42 TWY'P
100 _aTWYMAN, F
_973342
245 _aPRISM AND LENS MAKING
260 _aLONDON
_bADAM HILGER
_c1942
300 _a178P
942 _cBK
999 _c579109
_d579109