Holding Institution
- Williams College23
- Fordham University21
- Lehigh University21
- Rutgers University21
- University of Chicago20
- Cornell University19
- Saint Louis University17
- The Nelson-Atkins Museum of Art17
- University of Rochester15
- Grolier Club12
- University of California, Davis12
- Vassar College12
- Buffalo & Erie County Public Library11
- General Theological Seminary9
- Conception Abbey and Seminary6
- Smith College5
- New York Academy of Medicine3
- Newberry Library & Western Michigan University3
- American Academy in Rome2
- Providence Public Library2