UdG users
1970-03-08 Letter
1970-03-30 Letter
1970-04-18 Letter
1970-07-06 Letter
1970-08-12 Letter
1974-03-19 Letter
1974-07-15 Letter
1975-03-31 Letter
1975-06-19 Letter
1979-05-24 Letter
1979-07-10 Letter
1979-07-16 Letter
1979-07-21 Letter
1983-03-03 Letter
1984-01-26 Letter
1984-02-?? Letter
1984-02-20 Letter
1987-09-01 Letter