The exact spelling of a surname wasn't as important 1910, 1920 as it is today. Both spellings were probably acceptable.
I didn't find James nor Ruhama's deaths in Ancestry nor in FamilySearch. That surprizes me since death certificates were required in Indiana in 1900. You can contact the Owen County Health Department, www.owencounty.in.gov/ for copies of their death certificates.
You can contact the owen county library, www.sweetowen.net/ochgslibrary.html for copies of their obituaries. Successful Searching!