000 00267nam a2200109Ia 4500
008 190719s9999 xx 000 0 und d
100 _aCoal F Crist
245 0 _aEconomic models & methods
260 _aNew Delhi
_bWiley Eastern
_c1970
650 _aEconomics
942 _cBK
999 _c956
_d956