| Aluka | |
| Digital Collections at the Center for Research Libraries | |
| RIBA British Architectural Library (1984-) | |
| RISM Series A/II, Music Manuscripts after 1600 (1600-) | |
| Rotunda - The Dolley Madison Digital Edition | |
| Rotunda - The Papers of George Washington | |
| The Papers of James Madison Digital Edition/ | |
| WorldCat (1000 BC-) | |
| WorldCat.org | |
