UdG users
1955-03-10 Letter
1956-07-21 Letter
1958-10-07 Letter
1958-11-28 Letter
1959-05-02 Letter
1962-06-07 Letter
1962-08-10 Letter
1968-09-28 Letter
1977-01-14 Letter
[1974-11] Letter
[s.d.] Letter