1. Iowa State University, Ames, Iowa, and University of Cape Town, Cape Town, South Africa
2. University of California, Davis, Davis, California
3. University of California, Los Angeles, Los Angeles, California
4. Pacific Northwest National Laboratory, Richland, Washington
5. Lawrence Berkeley National Laboratory, Berkeley, California
6. Iowa State University, Ames, Iowa
7. National Center for Atmospheric Research, Boulder, Colorado
8. University of Georgia, Athens, Georgia
9. University of California, Irvine, Irvine, California
10. Cornell University, Ithaca, New York
11. Los Alamos National Laboratory, Los Alamos, New Mexico
12. The Pennsylvania State University, University Park, Pennsylvania