Data collections

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The Economic History Association's EH.net Databases

The Magazine of Early American Datasets (MEAD) at the McNeill Center of Early American Studies, University of Pennsylvania

FRASER: Discover Economic History, Federal Reserve Bank of St. Louis—includes scanned images of historical documents, e.g., Money Trust Investigation, 1912-1913, in 29 volumes

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

National Historical Geographic Information System—"provides free online access to summary statistics and GIS files for U.S. censuses and other nationwide surveys from 1790 through the present"

World Bank Open Data—"free and open access to global development data"

Digital tools

Great Buildings Collection, The Architecture Week—"the leading general architecture reference site"

Documenting Louisiana Sugar, 1845-1917, University of Sussex—searchable databases on cane sugar production

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)

CPI Inflation Calculator with data for the U.S. and a number of other countries

Measuring Worth, EH.net site for exploring the value of various currencies by various measures 

Infoplease's Perpetual Calendar