000 00309nam a22001337a 4500
999 _c155758
_d155758
082 _a
_b
100 _aB S Goel
100 _aJ D Sharma
245 _aA study of the evolution of the textbook/
_cby B S Goel and J D Sharma.
260 _a
_bNCERT,
_c1987.
300 _a271p.
650 _a
942 _cBK