The Tax History Project is “a public service initiative from Tax Analysts. Established in 1995, the Project provides scholars, policymakers, journalists, and the general public with information on the history of U.S. public finance.” Includes (but of course) tax history, but also offers the returns of select U.S. Presidents (take a look at F.D.R.’s 1040), an image gallery (cartoons, too), and primary source material.