More at Son of the South.
The Photographic History of the Civil War is a classic work available now as an ebook, in pdf format and in other ways online.
Thanks to reader FNH for the tip!!
D6 Shooters is a solo Old West Campaign game. The format could be adapted to a wide variety of periods and settings.
The d6 Shooters are a famous Old West posse, and you are their leader. In this solitaire Print-and-Play series, you will lead your posse on several adventures and missions, using a Yahtzee-style dice system to gain resources, movement and perform other important actions. There is always danger near, and your journeys will be very challenging to complete, but there is also the potential for great reward with untapped gold deposits among the California lands where you travel.
Here are a page of downloadable, printable flags for your American Civil War games. They’re quite nicely done.
The New York Public Library has a large collection of color plates of the armies of Finland in the 18th and early 19th centuries.