UdG users
1951-01-11 Letter
1953-05-28 Letter
1953-08-06 Letter
1953-11-01 Letter
1954 Letter
1954-03-20 Letter
1954-10-27 Letter
1955-02-04 Letter
1955-02-12 Letter
1955-08-29 Letter
1955-10-06 Letter
1956-04-24 Letter
1956-05-01 Letter
[1956]-05-25 Letter
1956-06-09 Letter
1956-07-20 Letter
[1956-10-07] Letter
1956-11-02 Letter
1957-02-13 Letter
1957-09-23 Letter
1957-10-30 Letter
1957-12-04 Letter
1957-12-10 Letter
1958-02-07 Letter