Content Provider
David Rumsey Historical Map Collection (Cartography Associates)
31
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
14
The Portal to Texas History (University of North Texas)
6
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
6
The Library of Congress: American Memory
5
Washington State University: WSU Libraries Digital Collections
3
University of Florida: Digital Library Center
2
APS Digital Library (American Philosophical Society)
1