000 00263cam a22000977a 4500
008 180718b1973 xxu||||| |||| 00| 0 eng d
082 _aL12x42 Un3o
245 _aThe operation of stage two
260 _aLondon
_bHer Majesty's Stationery Office
_c1973
300 _a51p.
999 _c500552
_d500552