ExchangeRate.com - XR World Rates
http://www.exchangerate.com/past_rates_entry.html
XR Past Rates™ are composite daily buy/sell rates based on Interbank and Official exchange rates as reported by central banks, international organizations, currency wholesalers, and government institutions. Interbank Rates are rates at which banks and brokers are willing to sell or buy currency in large volumes, usually in the millions of US Dollars.
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