000 00272nam a2200109Ia 4500
008 140917b1987 xxu||||| |||| 00| 0 eng d
082 _a534.55, CRA
100 _aA P Cracknell
245 _aUltrasonics
260 _aLondon :
_bWykeham,
_c1987
700 _aCracknell, A P
999 _c204447
_d204447