UdG users
1977-08-23 Letter
1977-09-30 Letter
1978-04-21 Letter
1978-09-07 Letter
1978-12-08 Letter
1980-01-16 Letter
1980-01-24 Letter
1980-02-06 Letter
1980-06-25 Letter
1982-02-09 Letter
1982-04-11 Letter
1983-02-28 Letter
1983-07-20 Letter
1983-08-18 Letter