November 18, 1976
letter
February 28, 1977
October 1, 1977
October 19, 1977
May 16, 1969
January 17, 1978
March 26, 1979
January 29, 1975
April 22, 1969
November 18, 1977
August 22, 1974
November 12, 1975
February 1, 1977
n.d.
February 2, 1978
January (?) 30, 1975
February 4, 1974
June 1, 1978
August 22, 1969
March 14, 1974
November 10, 1975
November 2, 1974
February 23, 1970
November 7, 1970
March 20, 1974
June 15, 1969
August 9, 1967
January 6, 1973
June 24, 1968
January 21, 1980
January 17, 1975
May 1, 1980
August 5, 1980
August 7, 1974
April 21, 1981
February 24, 1989
September 1, 1976
August 10, 1970
June 17, 1969
January 27, 1972
August 8, 1979
September 2, 1975
May 2, 1979
January 14, 1974
April 30, 1973
April 16, 1970
Jun 4, 1967
May 4, 1967
April 20, 1972
November 20, 1978