The best documentation I have seen in all my years of researching casualties, is a three volume set of books titled, Soldiers of the Great War in Three Volumes; an absolutely fascinating work of art that includes photos of each soldier.
You may view and or download them as follows,
- Soldiers of the Great War Volume One {Covers States Alabama to Maryland}
- Soldiers of the Great War Volume Two {Covers States Massachusetts to Ohio}
- Soldiers of the Great War Volume Three {Covers States Oklahoma to Wyoming}
In addition to the volumes, I have included the files from the Adjutant Generals Office of the War Department for Commissioned and Enlisted Army personnel. The files are broken down at a State level and are linked below.