UdG users
1948-09-10 Letter
1949-01-12 Letter
1949-03-04 Letter
1949-03-08 Letter
1949-10-05 Letter
1949-10-11 Letter
1950-01-27 Letter
1950-05-17 Letter
1951-01-22 Letter
1951-01-25 Letter
1951-06-06 Letter
1952-01-13 Letter
1952-02-18 Letter
1952-04-12 Letter
1952-11-01 Letter
1952-11-13 Letter
1952-11-19 Letter
1953-09-15 Letter
1954-02-09 Letter
1954-05-27 Letter
1954-10-27 Letter
1955-05-11 Letter
1955-06-18 Letter
1955-07-25 Letter