I see what looks like a private range near Cambell Texas on Google Earth. The coordinates are 33deg06min29.30 seconds North and 96degrees 02 minutes 18.19 seconds West.
It is just West of what appears to be a large lawn grass farm that is south of interstate 30 about 1.5 to 1.75 miles and about 5 miles southwest of Cambell. If anyone lives in this area or knows anyone who lives in this area it would be worth investigating.