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Growth and Convergence across the U.S: Evidence from County-Level Data
The authors use U.S. county-level data consisting of 3,058 observations, to study growth determination and measure the speed of income convergence. The data set allows the authors to include nearly 40 different conditioning variables to study their effect on the counties balanced growth paths.
Link
http://www.economics.emory.edu/Working_Papers/wp/higgins_03_06_paper.pdf