00293nam a2200121Ia 4500003000400000020001500004040000800019082001800027100001500045245006700060260002900127300001500156LDD  a0669012866  cLDD  a338.064 G563R  aGold, Bela 0aResearch technological change and economic analysiscBela Gold  aTorontobLexingtonc1977  aviii, 240p