- The Federico-Tena World Trade Historical Database: "The available series of world trade covered mostly the advanced world and were hopelessly outdated as they did not take into account all the research on foreign trade of the last thirty years. In contrast, our data-set uses all the most recent research we are aware of and covers almost all polities (independent countries and colonies) in the world after 1850, with few . . . exceptions. . . . For each polity we estimate series of imports and exports at current and constant prices (in 1913 dollars), both at current and 1913 borders." The data are free to use with attribution; the compilers will continue to update the series.
- Measuring Worth [from Samuel H. Williamson]: "There are two missions of this site. The first is to make available to the public the highest quality and most reliable historical data on important economic aggregates, with particular emphasis on nominal (current-price) measures, as well as real (constant-price) measures. The data presented here on the United States, the United Kingdom and Australia, have been created using the highest standards of the fields of economics and history, and they were rigorously refereed by the most distinguished researchers in the fields. The second is to provide carefully designed comparators (using these data) that explain the many issues involved in making value comparisons over time."
The Princeton University Library has digitized a number of posters from the Interborough Rapid Transit Subway Company . The posters, designed by the public relations firm Ivy Lee, were displayed in subway cars to provide information to riders about changes in fares and routes, safety issues, and other matters of interest. The collection consists of 385 images dating from 1918 to 1932; many of them provide financial information about rates, company dividends, and a general look at an early rapid transit system. October 29, update: Jonathan Rees over at "More or Less Bunk" was moved by this post to go off in search of a better site, and found the massive collection of the London Transport Museum , which displays over 5,000 items in a searchable collection .
