- Virtual Shanghai Project37
- Cochrane, Guy R.34
- Erdey, Mercedes D.26
- GreenInfo Network (Firm)22
- Bay Area Open Space Council21
- Bretz, Carrie K.21
- Conservation Lands Network21
- San Francisco Bay Area Upland Habitat Goals Project21
- San Francisco Redevelopment Agency (San Francisco, Calif.)21
- National Geophysical and Solar-Terrestrial Data Center19
- Johnson, Samuel Y.15
- National Atlas of the United States14
- Arrowsmith, John, 1790-187310
- Finlayson, David P.10
- EROS Data Center9
- Radefeld, Carl Christian Franz, 1788-18749
- Society for the Diffusion of Useful Knowledge (Great Britain)9
- Jefferys, Thomas8
- Sullivan, Elaine A.8
- Conrad, Jamie E.7
