000 00301nam a2200121Ia 4500
001 43721
008 170722s9999 xx 000 0 und d
100 _aSteniner, George
245 _aOn difficulty and other essays /
260 _aOUP :
_bOxford ,
_c1978.
300 _aPpxi+209
_c20cms
942 _cGEN
999 _c105454
_d105454