00305nam a2200109Ia 4500008004100000040001600041041001200057082001700069100001000086245006300096260003600159230917s9999||||xx |||||||||||||| ||und||  e25087aMAIN  aEnglish  a301.24 H122O  aHagen 0aOn the theory of social change: How economic growth begins  aNew YorkbFeffer & Simonsc1962