UdG users
1948-03-21 Letter
1948-08-27 Letter
1948-11-11 Letter
1949-02-19 Letter
1949-08-15 Letter
1949-10-24 Letter
1950-05-12 Letter
1950-08-27 Letter
1950-12-30 Letter
1951-06-02 Letter
1951-10-27 Letter
1952-07-10 Letter
1953-02-14 Letter
1953-03-10 Letter
1953-07-06 Letter
1954-02-16 Letter
1954-10-25 Letter
1954-12-25 Letter
1955-05-25 Letter
1955-10-23 Letter