UdG users
1959-09-08 Letter
1959-09-15 Letter
1959-11-14 Letter
1960-03-28 Letter
1960-11-14 Letter
1960-11-18 Letter
1960-12-06 Letter
1963-02-10 Letter
1963-03-22 Letter
1963-04-23 Letter
1963-07-11 Letter
1963-07-24 Letter
1966-01-03 Letter