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Data collections

    Macrohistory Database, National Bureau of Economic Research—mainly U.S. data but also some for France and Germany; pre-World War I and the interwar period

Digital tools

    Search for patents, U.S. Patent and Trademark Office—images of patents since 1790; requires a patent number or classification code for pre-1976 patents (see Carolyn Cooper's patent-finding tips)
    Measuring Worth, site for exploring the value of various currencies by various measures