HathiTrust
- Archive.org
Enslaved: Peoples of the Historical Slave Trade
- Library of Congress Digital Collections
o America Singing: 19th Century Song Sheets
o American Notes: Travels in America, 1750 -1920
- Harvard Library’s Immigration to the United States, 1789-1930
- Fordham University Internet History Sourcebook Project
- HathiTrust
- Archive.org