I found Andrew Gordon's death certificate in the Texas Death certificates on the Family Search website. He is listed as being buried in the Protestant Home for the Aged cemetery in San Antonio, Bexar Co., Texas. However, the cemetery no longer exists.
According to the San Antonio Genealogical and History Society website, burials were from 1912-1952. When the Home moved the bodies were reinterred.
Here's a page I made for Andrew Gordon on Footnote. Andrew Gordon
My next step is to contact San Antonio Genealogical and History Society.