000
00285nam a2200109Ia 4500
008
220421s1993 xx 000 0 und d
041
_a
eng
082
_a
507
_b
YAD/TEA
100
_a
Yadav ,M.S.
_9
571443
245
_a
Teaching of Science
260
_a
New Delhi
_b
Anmol Publications
_c
1993
999
_c
397671
_d
397671