I am researching my ancestors MUELLER and BARTH in Bosen and Soetern. One of the earlier links is a Johannes ZUMBRO. He came to Soetern from Graubuenden, Switzerland, some time before 1720, married Anna Barbara and had 3 children, Johannes Adam, Johannes and Johann Michel. A search of telephone listings in Graubuenden and Switzerland did not produce any Zumbros. Any help or suggestion on how to proceed would be greatly apreciated. Brigitte