UdG users
1984-05-22 Letter
1984-06-30 Letter
1984-07-16 Letter
1985-01-07 Letter
1985-08-12 Letter
1986-04-13 Letter
1986-06-25 Letter
1986-10-20 Letter
1987-01-16 Letter
1987-01-29 Letter
1987-03-01 Letter
1987-03-16 Letter
1987-04-09 Letter
1987-05-09 Letter
1987-06-10 Letter
1987-12-07 Letter
1988-01-22 Letter
1988-03-01 Letter
1988-05-06 Letter
1988-11-12 Letter
1990-12-28 Letter