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Scholarly and peer-reviewed articles about American history. Coverage dates: 1955 - present
Scholarly journals from first issue to 3-5 years ago, plus scholarly ebooks. Multiple subjects, especially strong in arts and sciences. Coverage dates: 1800 - present
Historical primary sources from around the world about a variety of subjects. Coverage dates: 1400 - present
Government information, ebooks, and primary sources from a variety of places, including Google, the Internet Archive, and libraries around the world. Coverage dates: 1850 - present
Primary sources from the Library of Congress and other institutions around the world. Coverage dates: 900 - present