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Try to locate the book "Elm Fork Settlements: Farmers Branch and Carrollton". It is in many of the Dallas County libraries. The call number is 917.6428 OGL. It was written and compiled by Georgia Ogle Myers. Also look for "Elm Fork Echoes" which was the Quarterly Publication of Peter's Colony Historical Society. It was published for several years and seems to have stopped shortly after Georgia's death in 1989. Both of these have a lot of interesting information on the residents of Farmer's Branch, their ancestors, and descendants.
Which families are you looking for? I am currently researching the descendants of persons buried in Webb Chapel Cemetery in Farmer's Branch for a reunion the cemetery association is planning for June 2002 in celebration of Isaac B. Webb's 200th birthday.
Isaac Webb & his wife Mary Hughes were some of the original settlers of the Farmer's Branch area in the 1840s. Many people of that community and their descendants are buried in Webb Chapel, Keenan, and Perry cemeteries in that area. You can find some of that information in the book "Dallas County Texas: Genealogical Data from Early Cemeteries" published by the Dallas Genealogical Society.