Oklahoma Genealogical Society
P.O. Box 12986
Oklahoma City, OK 73157-2986
www.rootsweb.com/~okgs
It publishes the Oklahoma Genealogical Society Quarterly (see Oklahoma Periodicals, Newspapers, and Manuscript Collections) and special publications, including the First Families of the Twin Territories, Special Publication No. 13 (Oklahoma City: Oklahoma Genealogical Society, 1997). This work includes six pre-statehood maps.