00338nam a2200109 a 450000500170000002000150001708200210003210000170005324501050007026000350017530000180021020251203091940.0  a8185427488  a025.431,bD, Raj  aRaju, A.A.N.  aDewey decimal classification (DDC 20): Theory and practice a practical and self instructional Manual  aMadrasbT.R.Publicationsc1995  a286p.c24 cm.