Extremely Rare Civil War Book For Sale

This is a very large book. I have showed it to many book experts and Noone seems to know where it came from or who it is by. I have also done a lot of research to figure it out but to no avail. It is full of original engravings by some very famous engravers. This book is considered a work of art and is extremely big! I believe it to be one of a kind . I recently inherited it with a huge collection of historical documents and artifacts from my grandfather's collection. Looking to give it a new home.