The following libraries and museums have generously provided digital images of manuscripts in their collections:

The Newberry Library

Columbia University Rare Book & Manuscript Library

DePaul University Library Special Collections & Archives

Folger Shakespeare Library

Houghton Library, Harvard University

The Huntington Library

The J. Paul Getty Museum

The Morgan Library & Museum

Special Collections Research Center, University of Chicago Library

Thomas Fisher Rare Book Library, University of Toronto