UdG users
1973-12 Letter
1973-06-17 Letter
1973-06-09 Letter
1973-05-30 Letter
1973-05-15 Letter
1973-04-04 Letter
1973-02-01 Letter
1973-01-10 Letter
1972-12-12 Letter
1972-11-17 Letter
1972-11-02 Letter
1972-10-26 Letter
1972-08-24 Letter
1972-08-18 Letter
1972-07-10 Letter
1972-07-08 Letter
1972-06-07 Letter
1972-04-18 Letter
1972-02-15 Letter
1972-01-08 Letter
1971-10-23 Letter
1971-08-02 Letter
1970-05-20 Letter
[s.d.] Letter