00271nam a2200121Ia 4500082002000000100001900020245004500039250000800084260003100092300001600123500000500139700000500144  a025.42bV637.CI  aVickery, B. C.  aClassification and indexing in scienceb  a3rd  aLondonbButterworthsc1975  a228p. Index  a  a