Let's go get stuff from these pages and post it (with appropriate source citation, if necessary) on the Wikipedia!
[Project Gutenberg] (See in particular PublicDomainBritannica?)
[Images of American Political History]
[US Census Bureau] -- has an enormous range of facts and figures which we will find helpful in fleshing out articles about cities and states.
[Occupational Outlook Handbook] -- contains descriptions of a great many occupations such as Physical Therapist