000 00221 a2200097 4500
001 18804
100 _aBaerwald f
245 _aEco. Progress & problem of labour
260 _a
_bbaerwald ITC
_c1970
090 _c13926
_d13926
942 _aNUST-CAE
_cM
_c4365
999 _c253877
_d253877