United States Patent and Trademark Office

Library of Congress

C-Span sponsored by the cable companies to bring a close-up look at the workings of government

Internal Revenue Service

U.S. Census Bureau

Demographic Trends in the Twentieth Century  A publication of the Census Bureau summarizing trends in population movements during the last century. Online document may be read using PDF format.

Medicare

Social Security Administration

Smithsonian

The Constitution of the United States 

U.S. Department of State

U.S. Department of Defense

U.S. House of Representatives

U.S. Senate

The Whitehouse

U.S. Mint

U.S. Postal Service