000 00258nam a2200109Ia 4500
008 240531s9999 xx 000 0 und d
082 _a173 OPE
100 _aNULL
245 0 _aPhilosophical logic
260 _aLondon
_b Open University
_c1980
942 _cANF
999 _c326396
_d326396