00507nam a2200181 a 450000500170000002000150001708200160003210000060004811000240005424500400007826000320011830000260015069000230017696400220019999700180022199900170023995200690025620251203110223.0  a8176491551  a371.35bVEN  d_  aVenugopal Reddy, V.  aWorld of open and distance learning  aNew DelhibViva booksc2000  axxii,494p.c22cm. HB.  aDistance education  bENGcd371efg_  a98814 LIBSS C  c82167d82167  00104070aPUbPUd2001-02-26g675.75l0o371.35 VENp98814yBK