I am looking for the 10-year and 20-year (A to AAA) corporate bond rates as far back as possible (to the 1920s, if available). Please don't give me general answers like "look in yahoo finance." I need specific directions on how to get to the right page. Thanks!





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http://research.stlouisfed.org/fred2/series/AAA
http://www.federalreserve.gov/releases/h15/data.htm
http://www.philadelphiafed.org/research-and-data/real-time-center/survey-of-professional-forecasters/data-files/BOND/
http://www.irs.gov/retirement/article/0,,id=123229,00.html