Great posts Asid, thanks. I hope you find Part 4.
I especially liked the map book by Phillip Laino referenced on the article. It is available on Amazon for $50 (There is a $299 used version for some reason) smile.amazon.com (http://smile.amazon.com)
I know the image below is displaying huge; however, it shows great detail. The "20MA" unit is, I believe without having the benefit of the book, the 20th Maine commanded by Joshua Chamerlain--depicted in the movie Gettysburg.
Cool stuff. I love maps and am really considering getting this book!
(https://images-na.ssl-images-amazon.com/images/I/81lVCLuThqL.jpg)