The Treasury Reporting Rates of Exchange, 1956-2005, which list the exchange rate of foreign currencies based on the dollar,are now available on GPO's FDsys, a one-stop portal to authentic, published government information.
This is a result of the partnership between the U.S. GPO and the U.S. Dept. of the Treasury to make historical digitized content available to public permanently. Over the next year, additional historical documents within the Treasury's library collection will be made available on FDsys including the Official Register of the U.S.: 1879-1959.
See more information on this: http://www.gpo.gov/pdfs/news-media/press/12news44.pdf