000 00247nam a2200109Ia 4500
008 160710s1945 xx 000 0 und d
100 _aBROWN,E.B
245 _aOPTICAL INSTRUMENTS
260 _bCHEMICAL PUB.
_c1945
300 _a567
942 _2ddc
_cB
999 _c6520
_d6520