I know your post was several years ago but my ancestors immigrated from Ostfriesland, Germany. They settled in Buffalo Center, IA. In 1992 the town celebrated it's centennial & published a wonderful book detailing the founding families complete w/ histories. Many families were from Ostfrieslan (as well as Norway, Sweden, etc.). What was so cool is that distant cousins from Ostfriesland, Germany came over for the celebration. I don't know if the book is still avaliable (ck. w/ the library)but there was a quite a nice display of the celebration when I was there in about 1998. Hope this helps.