Magical theory, mostly.

[ Curious as he may be about Enrprise history for its present-day context, he's not really devoted time to it that isn't chatting with locals. Instead, he's sought out books as a means to learn something... more practical. Which is why he doesn't really resonate as a "reader," per se. ]

But it's not that I'm interested. I prefer to learn on my own, and basic training only affords us so much.