UdG users
1976-06-22 Letter
1976-07-27 Letter
1976-09-20 Letter
1976-10-07 Letter
1976-11-07 Letter
1976-11-16 Letter
1976-12-10 Letter
1977-02-02 Letter
1977-08-25 Letter
1978-05-11 Letter
1978-05-23 Letter
1978-06-28 Letter
1978-07-31 Letter
1978-08-14 Letter
1978-11-17 Letter
1978-11-22 Letter
1979-03-14 Letter
1979-04-04 Letter
1979-08-17 Letter
1979-08-24 Letter
1979-08-27 Letter
1979-09-04 Letter
1979-09-10 Letter
1979-09-18 Letter