UdG users
1946-06-17 Letter
1946-09-29 Letter
1946-10-31 Letter
1947-12-13 Letter
1948-08-17 Letter
1948-08-24 Letter
1948-10-15 Letter
1948-12-27 Letter
1949-01-08 Letter
1949-02-17 Letter
1949-04-29 Letter
1949-10-16 Letter
1950-05-01 Letter
1950-05-08 Letter
1950-10-26 Letter
1950-11-25 Letter