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Place
- California--Coronado11
- New York (State)--New York7
- Pennsylvania--Philadelphia5
- New Jersey4
- Washington (D.C.)4
- California--Los Angeles2
- Chemical Heritage Foundation2
- Illinois--Evanston2
- Michigan--Midland2
- United States2
- California Institute of Technology1
- California---La Jolla1
- California--Berkeley1
- California--Menlo Park1
- California--Pasadena1
- California--San Diego1
- China--Beijing1
- Colorado--Boulder1
- Colorado--Coronado1
- Columbia University1