UdG users
1951-07-25 Letter
1953-09-06 Letter
1956-07-15 Letter
1956-07-21 Letter
1956-07-31 Letter
1956-09-01 Letter
1957-06-04 Letter
1957-06-25 Letter
1957-07-20 Letter
1957-12-10 Letter
1958-08-20 Letter
1959-02-09 Letter
1959-06-08 Letter
1959-07-07 Letter
1959-08-17 Letter
1959-09-21 Letter
1959-09-30 Letter
1959-11-20 Letter
1959-12-01 Letter
1960-02-19 Letter
1961-03-20 Letter
1961-08-10 Letter
1962-04-20 Letter
1962-08-10 Letter