If you would like to expand on your yLineage, this is the place to do it. Let others know if your GGG Grandfather had brothers and sisters, but don't forget to post that on the DNA Test Participants Needed forum. The more places you let everyone know your lineage, the better chances someone will find it in an internet search.
PHILLIPS: Oklahoma - The Indian-Pioneer Papers Oral History Collection
The Indian-Pioneer Papers oral history collection spans from 1861 to 1936. It includes typescripts of interviews conducted during the 1930s by government workers with thousands of Oklahomans regarding the settlement of Oklahoma and Indian territories, as well as the condition and conduct of life there. Consisting of approximately 80,000 entries, the index to this collection may be accessed via personal name, place name, or subject.
Searchable, from the University of Oklahoma, Western History Collection, at: