[Rome AH] - Useful Resources on Western Empire?

I'm trying to find as many resources as possible on the Western Roman Empire, before during and after their withdrawal from the British Isles. I'm mulling trying a "Arthur Pendragon, but slightly realistic" TL over on the ASB forum, but I figured it'd be best to have all my ducks in order first.

Thanks in advance,
Droman
 
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