The Spirit Lake Public Library is doing a tremendous job and service by hosting a cemetery transcription project. These recordings include contemporary as well as pioneer burials.
After clicking on the above link, a column of cemeteries will appear on the left side. In the near future there will also be links to "master" lists which will allow a researcher to locate surnames by various spellings. Included on the master list will be the cemetery location of the burial.
Good Luck in your research !