UdG users
1980-03-26 Letter
1980-04-30 Letter
1980-05-12 Letter
1980-06-14 Letter
1980-08-02 Letter
1980-08-16 Letter
1980-08-24 Letter
1980-09-10 Letter
1980-09-28 Letter
1980-11-07 Letter
1982-01-31 Letter
1982-04-08 Letter
1983-01-29 Letter
1983-09-15 Letter
1984-02-28 Letter
1984-06-08 Letter
1987-12-30 Letter
1984-01-07 Letter