Provider
- University of Auckland26
- Princeton8
- University of Minnesota8
- Cornell7
- Purdue University7
- Stanford6
- Baruch CUNY3
- GeoBlacklight Community2
- MIT2
- American Geographical Society Library – UWM Libraries1
- Harvard1
- NYU1
- Tufts1
- U.S. Geological Survey, Department of the Interior1
- UVa1
- University of Illinois Urbana-Champaign1
- University of Maryland1
- University of Michigan1