Check out Find A Grave, where you'll find a photo of his tombstone.
Stevenson, S A
b. Apr. 3, 1839 d. Aug. 16, 1915
Quaker Valley Cemetery
He is the only Stevenson on the listing.
Stephenson, Chase 43 1862/09-21 1903/11-07
Stevenson, S. A. 19 1839/04-03 1915/08-16
The Cemetery now called Stevenson Cemetery west of Galena, Kansas was before they replaced the sign Stephenson Cemetery. It was started by a Stephenson, and as far as I know, there isn't a Stevenson buried in it. http://www.findagrave.com/cgi-bin/fg.cgi?page=cr&CRid=93...