UdG users
1949-10-31 Letter
1952-12-29 Letter
1955-03-18 Letter
1956-11-25 Letter
1957-12-11 Letter
1958-08-06 Letter
1958-11-04 Letter
1958-11-09 Letter
1959-05-08 Letter
1959-11-29 Letter
1961-12-12 Letter
1964-10-07 Letter
1964-10-15 Letter
1964-10-28 Letter
1966-02-26 Letter
1966-10-25 Letter
1966-12-09 Letter
1967-07-04 Letter
1970-05-15 Letter
1970-05-28 Letter
1970-06-18 Letter
1970-08-24 Letter
1970-09-12 Letter
1970-10-28 Letter