The old Imperial Farm Cemetery appears in Chapter 6. Its not where the Sugar Land 95 were found, which is a mile or so away. The geocache is real, and Oliver, one of the authors,
and a member of Scout Troop 38 found and signed it once.
You can learn more about the Imperial Cemetery by clicking on the link below:
https://www.sugarlandtx.gov/2518/Restoration-of-Old-Imperial-Farm-Cemeter
Isreal Newson is indeed buried there
Here is a link to the geocache