000 00305nam a2200121Ia 4500
100 _aSingh, Ashok Kumar
020 _a978-0-07-065548-5
942 _cBK
245 _aScience & technology
_bfor civil services examinations
260 _aMcGraw - Hill, New Delhi
_c2008
082 _aR600 Sin
300 _a646
999 _c47463
_d47463