The Haeberlen newsletters were the contiunuation of the Haeberlen Book. Even after publishing of the Haeberlen Book, the Haeberlen Family were still a clan with tight bindings. The family meetings of the following years between 1935 and 1965 were documented in the following 7 Haeberlen Letters. Also the Family Tree was continued in these news letters.

Number 1 - February 1935
Number 2 - April 1940
Number 3 - April 1941
Number 4 - June 1952
Number 5 - September 1957
Number 6 - December 1957
Number 7 - June 1965