Terry,
As you are already familiar with the area this should be a snap to find.
It's named the Barnesville Cemetary. It is located approx. 3 miles east of Fulton, Kansas.
If you have the DeLorme Kansas Atlas & Gazetteer (highly recommended for backroads motoring!) it is in the D-4 area of page 66.
I think it's great that you guys are researching this area - between Ft. Lincoln, the wintering over at Barnesville by the 5th Kan. Cav., Mine Creek and Price's retreat through the area - there is alot of untapped history among the fields and streams of Linn & Bourbon counties.
Good luck with your project - I would really like to see what you compile one day!
Dean