UdG users
1948-07-18 Letter
1949-10-09 Letter
1950-02-27 Letter
1950-05-21 Letter
1950-09-02 Letter
1951-01-11 Letter
1951-02-28 Letter
1951-03-09 Letter
1951-05-11 Letter
1951-05-17 Letter
1951-07-28 Letter
1951-10-18 Letter
1951-10-20 Letter
1951-11-18 Letter
s.d. Letter