00589nam a2200181 a 450000500170000002000150001708200160003210000220004824500710007026000500014130000180019149000470020969000250025696400300028199700180031199900170032995200610034620251203110134.0  a0803935102  a300.72bBOR  aRoruch, Robert F.  aRandomized experiments for planning and evalutionbPractical Guide  aThousaNew Delhi OaksbSage Publicationsc1997  a263p.c23 cm.  aApplied social research methods seriesd44  aResearch methodology  bENGLISHcd300eBOOKfg_  a92085 LIBSS C  c79177d79177  00104070aPUbPUd1999-07-07l0o300.72 BORp92085yBK