Here are links to the Ranch itself:
Interactive topo map, with GPS coordinates. The red mark is appr. the NE corner of the tract and is at N29 32.800 W103 27.510. You can see it in your Mapsource software if you select "create new waypoint" and enter these coordinates. Then you can see we're near the landing strip and how far we are from Big Bend, Study Butte, etc.
Terlingua Ranch Home Page
Overview of Sections of the Ranch
North Corazones Section Detail <-- click on the section "20" that has a line running through it (that's a road) and look for tract #8498. That's ours :)