000			00333nam a2200133Ia 4500
008			140317s9999 xx 000 0 und d
020			_a9788192462370
082			_a500
100			_aSingh,R.K.
245			_aVigyan, Prithvi aur Manav Jeevan.
260			_aDelhi _bVigyan Sahitya Prakashan _c2013
300			_a199
942			_2ddc _cBK
999			_c17672 _d17672