@techreport{NBERw9017,
 title = "Intermediaries in the U.S. Market for Technology, 1870-1920",
 author = "Naomi R. Lamoreaux and Kenneth L. Sokoloff",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "9017",
 year = "2002",
 month = "June",
 URL = "http://www.nber.org/papers/w9017",
}