Historical GDP, where can I find information?

Factual Questions
1

I must be an internet sleuthing novice, because I cant seem to find any information on historical rates of GDP for the U.S. going back to 1900. The little bit of information I was able to find only went back till about 1940, and was in nominal amounts only.

Where can I find historical (back to 1900 preferably) GDP figures adjusted for inflation?

2

Try this

http://www.eh.net/hmit/gdp/