UdG users
1946-04 Letter
1946-11 Letter
1946-11-09 Letter
1947-02-13 Letter
1947-04-03 Letter
1947-05-26 Letter
1948-05-25 Letter
1949-07-24 Letter
1949-08-27 Letter
1950-12-19 Letter
1951-03-13 Letter
1952-06-16 Letter
1954-01 Letter
1955-12 Letter