I found this book at the University of Texas Pan American’s Special collections. If you are from La Grulla or just want to know more about it I highly recommend the following book. “Survival The Historical Heritage of La Grulla, Texas 1749 – 1974 a thesis by Narciso A. Guerra and Imelda G. Guerra”.
The authors also list their family connection to the first Longorias of La Grulla. You can also find a full map of La Grulla.
I just wish I had more time to go over it since you are not allowed to take it out of the Library I just quickly browsed through it.
If anyone else knows about any other books about La Grulla or it’s people let me know so that I can lsit them here.