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[9]
The Geographic Concentration of Industry: Does Natural Advantage Explain Agglomeration?[J] . Glenn Ellison,Edward L. Glaeser.The American Economic Review . 1999 (2)
[10]
Geographic Concentration in U.S. Manufacturing Industries: A Dartboard Approach[J] . Glenn Ellison,Edward L. Glaeser.Journal of Political Economy . 1997 (5)