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- Jahresbriefe / Annual Letters
- Annual Letter 1960
- Annual Letter 1961
- Annual Letter 1962
- Annual Letter 1963
- Annual Letter 1964
- Annual Letter 1965
- Annual Letter 1966
- Annual Letter 1967
- Annual Letter 1968
- Annual Letter 1969
- Annual Letter 1970
- Annual Letter 1971
- Annual Letter 1972
- Annual Letter 1973
- Annual Letter 1974
- Annual Letter 1975
- Annual Letter 1976
- Annual Letter 1977
- Annual Letter 1978
- Annual Letter 1979
- Annual Letter 1980
- Annual Letter 1981
- Annual Letter 1982
- Annual Letter 1983
- Annual Letter 1984
- Annual Letter 1985
- Annual Letter 1986
- Annual Letter 1987
- Annual Letter 1988
- Annual Letter 1989
- Annual Letter 1996
- Annual Letter 2010
- Annual Letter 2011
- Annual Letter 2012
- Annual Letter 2013