I am currently mailing an invitation to German Aufderheide's to contact me if they have an ancestor named Christian Aufderheide, my Great Grandfather's name. If you send me your Aufderheide immigrant's name, I will add it to my solicitation letter. You can then save the effort & cost of the mailings. I will share the responses with all who join in with the mailings. I have gotten one response from the 12 letters I have mailed so far. I just started on the 29th of August. Many more to send.
Ralph L. Sabiers firstname.lastname@example.org