I've been researching in that area for awhile and have never heard of a "Horse Valley Cemetery". There are numerous old cemeteries in Horse Valley and off of Horse Valley Road. Both cemeteries that come to mind are extremely old. The one is Keefer Cemetery it is across from the Gospel Mission and the other I'm not sure what the name is but if you keep going on the Horse Valley Road it will eventually turn into a dirt road and I believe it goes into the game lands. There will be an old cemetery among a grove of trees soon after you get on the dirt road. It's located on the right. There are also a few cemeteries located in Upper Strasburg. The Franklin County Historical Society in Chambersburg has a pretty listing of cemeteries and those buried there. If there is a "Horse Valley Cemetery" please let me know and it's location. Amy