00323nam a2200109Ia 4500082002100000100005400021245003400075260004800109300001600157500000500173700003500178  a519.532bEl37.SF  aElderton, William Palin and Johnson, Norman Lloyd  aSystems of frequency curvesb  aCambridgebCambridge University Pressc1969  a216p. Index  a  aJohnson, Norman Lloyd ;jt.auth