00283nam a2200097Ia 4500008004100000082002000041100001900061245004500080260004600125300001400171260223b        |||||||| |||| 00| 0 eng d  a658.57bT977.ER  aTybout , R. A.  aEconomics of research and developmentb/  aOhio:bOhio State University Press,c1965  axx, 458p.