000 00267 a2200109 4500
082 _a374.4
_bDIS
245 _aDistance Education
_b: an interface
260 _aHyderabad:
_bDr. B R A O U,
_c1994.
300 _b187p.
650 _aDistance Education
_9167701
942 _cBK
999 _c36827
_d36827