Hi, the burials that are listed on this site come from Montgomery County Death records and from cemetery readings that have been donated. Maybe William and R Eliz died, or their death certificates were recorded, in another county or under another spelling. I have a copy of the Sanders student reading from the 1940's and I did find William and R Eliz listed, so I have added their information.
http://history.montgomeryco.com/Def...d__gvfl1=5 The other burials on that listing were already on the site. Hope this helps answer your questions.