00418    a2200157   4500082001600000100001600016245003500032260006500067300001600132650002400148700001700172700002000189700001400209700001900223700001800242  a519.52bSAM  aParel, C.P.  aSampling design and procedures  aSingapore :bInternational development research c1973g1972  a53p.c22cm.  aStatistical methods  aFerrer, P.L.  aDe Guzman, G.G.  aTan, R.H.  aSinsioco, C.S.  aCaldito, G.C.