UdG users
1951-03-13 Letter
1951-09-11 Letter
1951-12-04 Letter
1952-06-16 Letter
1952-08-01 Letter
1953-06-28 Letter
1953-08-19 Letter
1953-08-20 Letter
1954-01 Letter
1955 Letter
1955-04-18 Letter
1955-04-23 Letter
1955-04-27 Letter
1955-08-15 Letter
1955-11-28 Letter