"EH.Net operates the Economic History Services web site and several electronic mailing lists to provide resources and promote communication among scholars in economic history and related fields. EH.Net is supported by the Economic History Association and other affiliated organizations: the Business History Conference, the Cliometric Society, the Economic History Society, and the History of Economics Society."
"EH.Net provides an on-line location for researchers in economic history to make their data series available to other professionals and interested scholars. Several data series have been given to EH.Net and are available as downloadable files, while many other titles may be accessed through our Database Directory."
List of databases on with links through to information on each series.
None explicitly specified as far as one can tell. "How Much is That" (now at states for each of its time series: