Did Elizabeth HELFERT come to America? If yes, her arrival manifest should have her place of birth. If she was naturalized citizen than the intent & petition will have her place of birth.
Location Alt Rohlau is in Czech Republic as
Alt-Rohlau, Stará Role populated place
50°15' N 12°50' E
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73.2 miles W of Praha 50°5' N 14°28' E http://www.kdejsme.cz/prijmeni/Helfert/