- Oklahoma State University. Department of Geography. Cartography Service28
- Bretz, Carrie K.22
- Erdey, Mercedes D.22
- Hartwell, Stephen R.21
- Manson, Michael W.21
- California. Department of Water Resources17
- Greene, H. G.17
- World Wildlife Fund (WWF)17
- Moss Landing Marine Laboratories14
- Environmental Systems Research Institute (Redlands, Calif.)11
- National Center for Ecological Analysis and Synthesis11
- Endris, Charles A.10
- Geological Survey (U.S.)10
- Watt, Janet T.10
- Ritchie, Andrew C.8
- Alameda County Registrar of Voters 7
- Conrad, Jamie E.7
- Dieter, Bryan E.7
- Finlayson, David P.7
- Nature Conservancy (U.S.)7
