UdG users
1935-11-23 Letter
1940-01-12 Letter
1940-10-31 Letter
1941-04-15 Letter
1941-06-17 Letter
1948-05-25 Letter
1949-01-09 Letter
1949-03-28 Letter
1949-07-26 Letter
1949-10-31 Letter
1949-12-28 Letter
1950-02-13 Letter
1950-02-14 Letter
1950-06-05 Letter
1950-09-04 Letter
1951-05-07 Letter
1951-09-28 Letter
1951-10-17 Letter
1951-10-26 Letter
1951-11-08 Letter
1952-01-11 Letter
1952-07-18 Letter
1952-08-11 Letter
1952-09-26 Letter