%0 Report %T Fundamentals or Population Dynamics and the Geographic Distribution of U.S. Biotechnology Enterprises, 1976-1989 %A Zucker, Lynne G. %A Darby, Michael R. %A Peng, Yusheng %D 1998 %B NBER Working Paper Series %I 6414 %C Cambridge, MA %U http://papers.nber.org/papers/w6414.pdf %I National Bureau of Economic Research