The Clark-Dickey cemetery includes half a dozen or so of the vernacular cast concrete tablet style markers like the one shown below; none were made using lettering kits.
The photo above is from the Smith Cemetery; it's the most noticeable grave there. No inscription was visible on the tablet.
The book-on-a-stick erected by the Texas Historical Commission suggests that both cemeteries began as family cemeteries, but notes a connection between the two, making it even odder that they're physically separate. Local sources suggested that the fencing is wrong, the two cemeteries were connected, and more graves exist than are currently known or marked. Whether or not that's true would require a thorough archeological survey, including the use of ground penetrating radar, a highly unlikely scenario given that both cemeteries appear to fall within the Sandy Creek riparian zone and are thus unlikely to be impacted by any future logging operations on that portion of the Forest.
Both cemeteries are located on the Sabine National Forest.