UdG users
1959-06-30 Letter
1960-08-23 Letter
1960-09-02 Letter
1965-09-10 Letter
1965-09-23 Letter
1965-11-02 Letter
1965-11-10 Letter
1965-12-06 Letter
1982-07-13 Letter
1982-07-30 Letter
1982-08-05 Letter
1986-01-04 Letter
1986-01-09 Letter
1986-01-25 Letter
1988-07-05 Letter
1988-07-15 Letter
1988-07-25 Letter
1988-08-27 Letter
1988-06-03 Letter