UdG users
1946-10-31 Letter
1947-03-01 Letter
1947-07 Letter
1947-11-13 Letter
1948-08-18 Letter
1948-10-02 Letter
1949-10-04 Letter
1949-10-05 Letter
1949-11-28 Letter
1950-10-25 Letter
1950-11-12 Letter
1950-12-04 Letter
1950-12-12 Letter
1950-12-20 Letter