UdG users
1951-05-11 Letter
1951-05-17 Letter
1951-05-21 Letter
1952-09-25 Letter
1953-11-09 Letter
1953-11-24 Letter
1955-03-30 Letter
1956-09-04 Letter
1956-09-11 Letter
1956-09-27 Letter
1958-02-24 Letter
1958-06-10 Letter
1958-06-17 Letter
1958-08-01 Letter
1958-09-02 Letter
1958-12-01 Letter
1959-11-13 Letter
1960-10-17 Letter
s.d. Letter