000 00296nam a22001097a 4500
082 _a520
_bBHA.U
100 _aBhatnagar, P L
245 _aUniverse /
_cby P L. Bhatnagar
260 _aNew Delhi :
_bNational council of educational research and training,
_c1967.
300 _a200p. :
942 _cBK
999 _c632523
_d632523