From the GPO:
The U.S. Government Printing Office (GPO) and the U.S. Department of the Treasury are partnering on a pilot project to make digitized content from the Treasury library available on GPO’s Federal Digital System (FDsys).
Through the pilot project, the Treasury Reporting Rates of Exchange, 1956-2005, which list the exchange rates of foreign currencies based on the dollar, are now available on FDsys.
More Data On the Way
Over the next year, additional historical documents within the Treasury’s library collection will be made available on FDsys, including the Official Register of the United States: 1829-1861; 1879-1959, a publication with information about the Federal workforce, including the name of every employee, their job title, state or country of birth, the location of their post, and their annual salary.