000
00280nam a2200109Ia 4500
008
211214s9999 xx 000 0 und d
100
_a
Siddiqi, N. N. and Siddiqi, N.
245
_a
Teaching of Science: Today and Tomarrow
260
_b
Doaba
_c
2009
300
_a
754
942
_c
BK
999
_c
102030
_d
102030