000 00257nam a22000857a 4500
008 210311b ||||| |||| 00| 0 eng d
050 _aTK7871.3
245 _aAn introduction to masers and lasers
_cMELIA, T.P.
942 _2lcc
_hTK7871.3 .M45 1967
999 _c2225
_d2225