000 00261nam a2200121Ia 4500
008 211209s1968 xx 000 0 und d
041 _aeng
082 _a511.3 N68 MOR
100 _aMORTON L S
245 _aLANGUAGE OF LOGIC
260 _c1968
300 _a247
999 _c14641
_d14641