One of the joys of hunting for stuff like this is learning about stuff I don’t know. Mailman dropped off another book today
“They called them Soldier Boys” by Gregory W. Ball. It’s the history of the 142nd Infantry Regiment in WW1. Not grandpas 141st, but they were right next to them throughout the war. Sadly no luck on a specific 141st history.
The definitive work on the 36th is a bit out of my price range right now with the lowest price being $200.
The Ball book gives a good accounting of the formation of the Texas regiments as well as more specifics on the combat in WW1, with good maps to go with accounts of the fighting. Might be worth your while if you want some good background on grandpa’s war.