Well, the 1861 and 1900 ones were a mess (it was the birth of WiR)

Here are two different versions of 1920 (the best WiR out there):

[url=http://forum.paradoxplaza.com/forum/showthread.php?721094-Forum-Game-World-in-Revolution-1920]1920[/url]
[url=http://forum.paradoxplaza.com/forum/showthread.php?796822-Forum-Game-World-in-Revolution-1920-Mk.-II]1920 Mk.II[/url]