http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&d...In case you haven't already found it, appears that all past residents of Geislingen are listed at that site.
I am great, great granddaughter of Herman Buehler b 27 Apl 1868, died Chicago 09 Dec 1940. I am sure the Hermann Bühler listed there is my ancestor.
