Good Historical Sources on Camillan Romans

[A Terribly Harmful Name]

Hello,

EB is perhaps the only mod of the 270 B.C timeframe that depicts the earlier stages of the Roman Legion, that is, the "Camillan Military Era". Usually most mods and vanilla itself depict the Romans already in the Polybian stage by then.

I have a question: are there any good books or websites that mention "Camillan" troops in detail? Why aren't they so famous if according to EB they lasted up the mid 3rd century? Any source that the EB team originally used to make them is welcome.