UdG users
1948-07-28 Letter
1948-08-22 Letter
1948-11-11 Letter
1949-03-17 Letter
1949-05-16 Letter
1949-12-11 Letter
1951-01-09 Letter
1951-10-12 Letter
1952-07-10 Letter
1953-06-10 Letter
1953-10-27 Letter
1954-02-16 Letter
1955-04-12 Letter
1955-05-10 Letter
1955-07-25 Letter
1955-10-26 Letter
1956-01-20 Letter
1956-02 Letter
1956-03-16 Letter
1956-10-05 Letter
1957-02-03 Letter
1957-07-13 Letter
1957-10-09 Letter
1957-11-01 Letter