UdG users
1980-03-01 Letter
1980-08-07 Letter
1981-01-28 Letter
1981-05-31 Letter
1983-12-03 Letter
1984-09-29 Letter
1984-12-31 Letter
1986-01-09 Letter
1986-07-22 Letter
1986-11-11 Letter
1988-09-22 Letter