Photos
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| 1933 | 1939 | 1940 | 1943 | Flatbrookville, 1947 |
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| 1950 | Coronation stone Ireland, 1973 |
1974 | 1975 | St. Marks, 1975 |
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| 1982 | 1983 | New River, West Va. | Peacock Hill, 1985 | Hegel's grave Berlin, 1987 |
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| 1991 | 1993 | 2002 | 1998 | |
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| 2000 | China, 2004 | Stanford | ||
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| Santa Cruz | France | 2007 |