00285nam a2200109 a 450000500170000002000150001708200150003210000170004724500450006426000450010930000210015420251203110053.0  a817169540X  a020.6bKOC  aKochar, R.S.  aEffective librarybsystems and practices  aNew DelhibCommonwealth Publishersc1999  av, 371p.c23 cm.