UdG users
1946-06-22 Letter
1948-12-22 Letter
1949-02-08 Letter
1949-06-11 Letter
1951-01-15 Letter
1951-07-12 Letter
1952-12-20 Letter
1953-01-09 Letter
1953-12-27 Letter
1954-06-05 Letter
1956-11-19 Letter
1957-12-06 Letter
1958-02-12 Letter
1958-10 Letter
1959-03-09 Letter
1959-05-14 Letter
1959-09-29 Letter
1960-04-20 Letter
1960-05-06 Letter
1960-05-31 Letter