Early English Books (EEBO) - books and periodicals 1473-1700. Primary resources for Briitish history which includes colonial America and Canada.
History Reference Center - full text from more than 1,620 reference books, encyclopedias and non-fiction books, cover to cover full text for more than 150 leading history periodicals, nearly 57,000 historical documents, more than 78,000 biographies of historical figures, more than 113,000 historical photos and maps, and more than 80 hours of historical video.
New York Public Library Digital Collections - images, prints, videos, maps, and documents on a wide variety of historical topics.
THe National Archives -
National Archives Documents Collections
U.S. Government Printing Office