Hi Roland, There is no list for the county. Sometimes the cemetery is listed on the obituary or sometimes on the death certificate.
You can send an email to Sue@bakerlib.org who will search for their obituaries.
By the way, George M. Walk Died: 29 Oct 1923, Baker Co. Certificate: 140
Althea Gertrude Walk Died: 17 May 1926, Baker Co. Certificate: 81 Source for Both: Oregon Death Index 1903-98.
If it's not on their obituaries, the death certificates of this vintage are filed with the Oregon State Archives, arcweb.sos.state.or.us/county/cpbaker/death.html . Contact the State Archives and they'll tell you how to get copies. Successful Searching!