UdG users
1966-01-20 Letter
1966-02-13 Letter
1966-03-24 Letter
1966-05-11 Letter
1966-11-24 Letter
1966-11-30 Letter
1966-12-27 Letter
1967-07-22 Letter
1967-10-02 Letter
1968-09-10 Letter
1969-05-13 Letter
1969-09-07 Letter