National Archives
Teach with documents using their online tool.
Life Magazine and Google
You can search millions of photographs from the LIFE photo archive, stretching from the 1750s to today. Most were never published and are now available for the first time through the joint work of LIFE and Google.
http://images.google.com/hosted/life
or Life’s website
Making of America
Making of America (MoA) is a digital library of primary sources in American social history from the antebellum period through reconstruction.
http://quod.lib.umich.edu/m/moagrp/
History Matters
Designed for high school and college teachers and students, History Matters serves as a gateway to web resources and offers other useful materials for teaching U.S. history.
http://historymatters.gmu.edu/
American Library Association
The Reference and User Service division of The American Library Association has a site which give excellent information on how to find, evaluate and cite primary sources on the web.
http://www.ala.org/rusa/sections/history/resources/pubs/usingprimarysources#finding
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