UdG users
1945-10-26 Letter
1948-02-16 Letter
1948-08-22 Letter
1949-01-15 Letter
1949-03-22 Letter
1949-08-12 Letter
1950-04-25 Letter
1950-12-11 Letter
1951-10-12 Letter
1952-12-22 Letter
1955-10-29 Letter
1956-11-10 Letter
1957-01-29 Letter
1957-02-03 Letter
1957-07-13 Letter
1958-01-05 Letter
1958-01-30 Letter
1958-05-09 Letter
1958-12-06 Letter
1959-03-20 Letter
1959-05-28 Letter
1959-12-15 Letter
1960-03-19 Letter
1960-12-09 Letter