There is a lot of emphasis on using documents and primary resource in the classroom. Below are a list of links that are helpful for finding primary documents for social studies. They are divided into categories for easy searching.

General

The National Archives
The following websites inlcude a fantastic database for primary resources and many include lesson plans:
National Register of Historic Places http://www.nps.gov/history/nr/twhp/descrip.htm
http://www.edteck.com/dbq/basic/links.htm
Primary Source Learning
http://www.primarysourcelearning.org
Smithsonian http://www.smithsoniansource.org/
Center on Congress http://www.tpscongress.org/

Library of Congress http://www.loc.gov/teachers/tps/

U.S. History

TeachingAmericanHistory.org
http://www.nelson-atkins.org/art/creatingamerica/index.cfm Online art gallery

Geography

Government

Economics