I have listings for Cemeteries in Kiowa County, OK. I have found your Gerhard Kliewer, I believe. with possibly other family members.
They are buried in the Ebenezer Mennonite Cemetery- located 3 miles east of Gotebo and 1 mile north off Highway 9. It is the Cemetery for the Ebenizer Mennonite Church. Kliewer, Daniel Jay 12/28/1991 to 2/24/1992 Kliewer, Helen 1920 to 1991 Kliewer, Justina 1881 to 1934 Kliewer, Menno 1906 to 1916 Kliewer, Paul 1911 to 1911 Kliewer, Peter G. 1876 to 1959 Kliewer, Rev. G. G. 1834 to 1913 [This is him, I believe.]