I have published Granville’s letters that are at LSU in my book The Defense of Vicksburg: A Louisiana Chronicle. They are most revealing and are what you would expect of a 16-year-old boy even today.
Granville’s letters were published in the Louisiana Historical Quarterly in 1946 and when I opened the file that the letters were in I found 13 more letters that had not been published, including a letter to his cousin.
What is your interest in these letters? If you have any additional information on Granville or his family I would like to see it.
Let me know if I can be of any further help.
Allan Richard