@techreport{Kim2007,
author = {Kim, S.},
title= {Immigration, Industrial Revolution and urban growth in the United States, 1820-1920: Factor endowments, technology, and geography},
year = {2007},
doi = {10.3386/w12900},
publisher = {National Bureau of Economic Research},
address = {Cambridge},
institution = {NBER working paper 12900},
}