UdG users
1972-06-05 Letter
1972-09-28 Letter
1972-10-13 Letter
1972-11-07 Letter
1972-12-12 Letter
1972-12-24 Letter
1973-01-06 Letter
1973-02-05 Letter
1973-04-07 Letter
1973-04-24 Letter
1973-05-10 Letter
1973-11-14 Letter
1973-11-15 Letter
1974-01-17 Letter
1974-01-18 Letter
1974-01-28 Letter
1974-01-29 Letter
1974-03-09 Letter
1974-03-14 Letter
1974-11-02 Letter