Friends, I am working on making some map overlays for my own reference of the lines from the Railroad Redoubt through the 2nd Texas Lunette. What I am doing is trying to mark the approximate locations by redrawing the the regiment locations over a current Google Earth Aerial view. How I am doing this is by overlaying battle maps and reducing the opacity in photoshop to see where they were compared to the current day condition of the battlefield. My problem is that none of the readily available maps I am using seem to really match up. Using the railroad as a guide and where the NPS has the Railroad Redoubt recreated is not corresponding with the maps I have. I realize that there is alot of variation with these maps, but can anyone recommend a source of some high quality digital battle maps i may have overlooked. The Civil War Preservation Trust maps are usually pretty good as they indicate current terrain, but even these are not lining up. Any thoughts???