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National Museum of the American Indian: "How many Indians lived in America before 1942?"
http://www.nmai.si.edu/explore/education/did-you-know/ -
"Letter to Luis Santangel Regarding the First Voyage" - C. Columbus
https://youtu.be/fZBGl8R18iU -
"A Description of New England" - John Smith
https://youtu.be/5RzzQReDirk -
"The Pioneers" - James F. Cooper
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Philadelphia
ushistory.org's Declaration of Independence website: http://www.ushistory.org/declaration/ -
Between 1839 - 1889
https://youtu.be/mGq1iQ-tXzc