000 00281nam a2200109Ia 4500
008 220204s9999 xx 000 0 und d
082 _a5:002
_bCHH
100 _aChhotey Lal
245 0 _aInformation sources in science and technology
260 _aDelhi
_bBharati
_c1986
942 _cBK
999 _c39455
_d39455