Booker T. Washington Cemetery is located in Muskogee, Oklahoma. It is named after Booker Taliaferro Washington (April 5, 1856 – November 14, 1915), an American educator, author, orator, and advisor to presidents of the United States. Between 1890 and 1915, Washington was the dominant leader in the African-American community. (source: wikipedia.org/wiki/Booker_T._Washington; accessed Jan 8, 2018
There appears to be no website online for this cemetery, and no information about it (aside from the headstone / internment listing websites such as Find A Grave etc). Based on data on BillionGraves.com, the earliest internment may have been for one Burt Newton, who (according to numbers scribed onto a homemade headstone) lived from 1894 to 1908. Interment records for persons having died in 2016 and 2017 suggest that the cemetery is still active, but it is not clear if plots are still available to be purchased.
When I visited this cemetery in May 2016, I was surprised by the number of damaged, toppled and overgrown headstones - at least in the north-west portion of the cemetery. Apparently upkeep at this cemetery has been challenging, based on this 2015 newspaper article describing one man's efforts to not only maintain the cemetery but also to uncover and correct some of the effects caused by years of neglect.
Some websites listing interments for this cemetery:
Find A Grave
Billion Graves (scroll down the page to find the search box)
Oklahoma Cemeteries
usgennet
(note: subscriptions or accounts are NOT required to search the data - you can close any dialogue boxes that might pop up requesting you to sign up or log in)