000
00286nam a2200121 4500
020
_a
978-8171415687
022
_a
8171415687
100
_a
D.B. Rao
245
_a
Science and Technology Education
260
_a
New Delhi
_b
Discovery Publishing House
_c
2020
300
_a
557
942
_c
BK
999
_c
4358
_d
4358