UdG users
1955-06-30 Letter
1955-12-19 Letter
1959-05-05 Letter
1959-05-23 Letter
1959-06-13 Letter
1959-06-19 Letter
1959-07-28 Letter
1959-07-30 Letter
1960-02-19 Letter
1960-02-24 Letter
1960-10-06 Letter
1965-04-05 Letter
1965-05-11 Letter
1965-06-02 Letter
1965-10-21 Letter
1969-01-09 Letter
1975-02-28 Letter
1980-10-02 Letter
[s.d.] Letter