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Creative Commons - copyright friendly
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Digital Public Library of America - primary sources
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Gilder Lehrman Institute American History -
primary sources
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Library of Congress - primary sources
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morgueFile - free photo archive
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National Archives - Docs Teach primary sources
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PhotoPin - Free Creative Commons images
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Photos for Class - copyright friendly images
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Pics4Learning.com - copyright friendly images
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pixabay - free images
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Smithsonian Flickr photos - primary sources
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visualhunt - copyright friendly images
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