UdG users
1955-03-18 Letter
1955-03-29 Letter
1955-04-08 Letter
1955-04-20 Letter
1955-04-29 Letter
1955-05-06 Letter
1956-05-30 Letter
1956-06-10 Letter
1956-09-19 Letter
1956-10-17 Letter
1956-11-10 Letter
1956-11-25 Letter
1957-02-19 Letter
1957-02-27 Letter
1957-04-13 Letter
1957-04-25 Letter
1957-07-14 Letter
1957-12-04 Letter
1958-10-30 Letter