00270nam a2200133Ia 4500020000900000082001000009100001500019245003800034250000900072260003300081300000800114500000800122650000600130  aNULL  a575.1  aOld, R. W. 0aPrincipal Of General Manipulation  a1989  aOxfordbBlackwell Publishing  a438  a550  a-