000 00297nam a2200109Ia 4500
008 191024s9999||||xx |||||||||||||| ||und||
100 _aSadachari Singh Thomar
245 0 _aKhethi Ke Vaikalpik Oorja Sroth
260 _bNational Publishing Hosue
_aNew Delhi
_c1985
650 _aScience
942 _cBK
999 _c54807
_d54807