UdG users
1955-10-13 Letter
1955-10-25 Letter
1959-06-13 Letter
1965-02-01 Letter
1965-04-04 Letter
1965-11-21 Letter
1965-12-19 Letter
1966-06-01 Letter
1966-06-02 Letter
1966-08-10 Letter
1967-04-24 Letter
1967-05-08 Letter
1968-12-?? Letter
s.d. Letter
1969-11-02 Letter