Mark,
I certainly wish I could give any info on book about Robert Latham.
My GG Grandfather was in the 106th Illinois, Co. G. Pvt. Wesley Dines.
According to family history He & Col. Latham were good friends..
But to my knowledge there are no books about the 106th...
However I can be wrong.
You can find the usual Regimental histories OK...
If you find a book or anything on the 106th can you please contact me,
Thank you,
Bob