UdG users
1952-06-20 Letter
1952-09-17 Letter
1952-12-15 Letter
1953-01-04 Letter
1953-02-03 Letter
1953-03-31 Letter
[1953]-08-16 Letter
1955-09-23 Letter
1955-10-02 Letter
1955-10-03 Letter
1955-10-17 Letter
1955-10-20 Letter
1955-11-01 Letter
1955-11-12 Letter
1955-12-01 Letter
1956-01-19 Letter
1956-01-30 Letter
1956-02-02 Letter
1956-02-12 Letter
1956-02-21 Letter