1. Duke University Libraries, Duke University, Durham, NC 27708, USA.
2. University of Minnesota Libraries, University of Minnesota, Minneapolis, MN 55455, USA.
3. Princeton University Library, Princeton University, Princeton, NJ 08544, USA.
4. University of Michigan Library, University of Michigan, Ann Arbor, MI 48109, USA.
5. University Libraries, University of Nebraska–Lincoln, Lincoln, NE 68583, USA.
6. UC Santa Barbara Library, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
7. University Library, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA.
8. Data, Academic Planning & Institutional Research, University of Wisconsin–Madison, Madison, WI 53706, USA.
9. UVA Library, University of Virginia, Charlottesville, VA 22904, USA.
10. Liberal Arts Technologies and Innovation Services, University of Minnesota, Minneapolis, MN 55455, USA.
11. WashU Libraries, Washington University in St. Louis, St. Louis, MO 63130, USA.
12. University Libraries, Virginia Tech, Blacksburg, VA 24060, USA.
13. Scholars and Scholarship, Association of Research Libraries, Washington, DC 20036, USA.
14. Penn State University Libraries, Pennsylvania State University, University Park, PA 16802, USA.