000 00321nam a2200133Ia 4500
008 020221t1964 000 0 eng d
080 _a535.21 HEA
_b4406
100 _aHeavens, O.S.
245 0 _aOptical masers
_h(Book)
260 _aLondon
_bMethuen
_c1964
300 _a103p.
_c23 cm.
650 _aLasers
999 _c4653
_d4653
035 _a4406