00346nam a2200109Ia 4500008004100000082001800041100002300059245002400082260005500106630001800161650005700179211109s9999||||xx |||||||||||||| ||und||  a550.76bSUB-Y  aSubbayya Pillai, P 0aYathrakkaril Chilar  bKamalalya Printing WorksaThiruvananthapuramc1978  xGENERAL STACK  aNATURAL SCIENCE& MATHEMATICSvEARTH SCIENCEGeneralia