Data

1. Sarada, Michael J. Andrews, and Nicolas L. Ziebarth. 2019. American Inventors, 1870-1940. Ann Arbor, MI:ICPSR. 

2.  Chris Vickers and Nicolas L. Ziebarth. 2023. United States Census of Manufactures, 1929-1935. Ann Arbor, MI:ICPSR. ("Stable" version)

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