American Prohibition
http://www.cohums.ohio-state.edu/history/projects/prohibition/default.htm
Texts and images.

Berenice Abbott's Changing New York
http://mcny.org/homeab.htm
Photographs of Manhattan, 1925-37

Harlem: Mecca of the New Negro
http://etext.lib.virginia.edu/harlem/
The March 1925 issue of Survey Graphic, which described the Harlem Renaissance

Louise Brooks
http://www.pandorasbox.com/
The immortal actress and the Jazz Age

New Deal Network
http://newdeal.feri.org/
A large database of documents and photographs, supplemented by thematic exhibits.

Porgy, by Dubose Heyward
http://xroads.virginia.edu/~HYPER/PORGY/porghome.html
The novel of Charleston on which Porgy and Bess was based.

U.S. Historic City Maps
http://www.lib.utexas.edu/Libs/PCL/Map_collection/historic_us_cities.html
Maps of American cities, mostly from 1919 and 1920.

Washington as It Was, 1923-1959
http://lcweb2.loc.gov/ammem/thchtml/thhome.html
Over 14,000 photographs of Washington, DC, arranged by subject.