U.S. History: 19th c: Closing of the Frontier
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| Author | Title | Edition | Format | Price | Puborg |
| Hough, Emerson | The Passing of the Frontier: A chronicle of the Old West (Chronicles of Amer. Ser. #26) | 1920NHavn | Graphic PDF | Free | Harvard |
| Hough, Emerson, 1857-1923 | The Passing of the Frontier: A Chronicle of the Old West (Chronicles of America #26) | 1918 | Txt-G | Free | GutenbergUS |
| Peffer, E. Louise | The Closing of the Public Domain: Disposal & reservation policies, 1900-50 | 1951] Stanf | Graphic | Free | CornellU |
| Turner, Frederick Jackson | The Frontier in American History | 1935 | Html | Free | UVa-AmStd |
| Turner, Frederick Jackson | The frontier in American History | 1920 NY | Graphic | Free | CornellU |
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