UdG users
1951-01-06 Letter
1951-01-08 Letter
1951-01-30 Letter
1951-03-26 Letter
1951-05-06 Letter
1951-07-10 Letter
1951-07-26 Letter
1951-09-05 Letter
1951-10-27 Letter
1952-11-24 Letter
1952-12-27 Letter
1953-10-13 Letter
1955-07-12 Letter
1955-09-09 Letter