UdG users
1962-11-16 Letter
1967-10-07 Letter
1967-12-15 Letter
1968-05-29 Letter
1969-05-09 Letter
1969-05-13 Letter
1980-09-20 Letter
1980-10-04 Letter
1980-12-01 Letter
1981-05-05 Letter
1981-05-29 Letter
1983-06-08 Letter
1983-09-20 Letter
1983-10-23 Letter
1983-11-10 Letter
1985-06-11 Letter
1985-06-?? Letter
[1980-10-12] Letter
s.d. Letter