000			00287nam a2200121Ia 4500
008			211209s1973 xx 000 0 und d
041			_aeng
082			_a301.240 151 N 73 ROB
100			_aROBERT L H
245			_aMATHEMATICAL THEORY OF SOCIAL CHANGE
260			_c1973
300			_a237
999			_c15609 _d15609