Smithsonian Institution
Smithsonian Learning Lab: What Is Currency? Lessons From Historic Africa
From the Smithsonian, this site offers lessons and resources on currency, its use (in the form of gold dust, salt, or metal objects) as an instrument of trade in historic Africa, and its requirements as an instrument of trade in the...
Federal Reserve Bank
Federal Reserve Bank of St. Louis: Fred Economic Data
With files in many categories, FRED offers a wealth of historical US data on interest rates, business indicators, balance of payments, exchange rates, and lots more.