00314nam a2200121Ia 4500008004100000040001700041041001200058082001700070100002100087245003500108260003800143300001100181230917s9999||||xx |||||||||||||| ||und||  e146849aMAIN  aEnglish  a301.24 H122O  aHagen, Everett E 0aOn the theory of social change  aNew YorkbFeffer and Simonsc1962  a157 p.