where would I get historical data for S&P 500 index, US small stock, corporate and government bonds, T-Bills?

Answer 1

Link to historical returns for stocks, t-bills and T bonds since 1928

http://pages.stern.nyu.edu/~adamodar/New_Home_Page/datafile/histretSP.html
For the S&P, go to http://finance.yahoo.com and click on the S&P index listed on the left side. Once it comes up, click on "Max" under the chart. A new chart will come up graphing the S&P back to 1955. At the bottom of that page is a link to "Historical Pricing". You can select any date range you like and look at the pricing by day, week, month, or dividend basis.
This same feature is available for most stocks and indexs.

Answer 2

Try researching history of currency and securities on the US Treasury Dept. website.