Click on the key map of Harris County to go to a larger scale key map, index page.
Clicking on the red cells above and underneath the map will bring up a larger map of the selected cell.
The Harris County Map is a subset of Texas Railroad Commission District 3, specifically available for section for the Dynamic Resources Lead Generation Machine at:
http://www.walden3d.com/dynamic/counties/texas, then click on "District 3 SE".
This page is at: http://www.walden3d.com/H/index.html