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It's insane that the single most complete and lucid collection of graduate-level physics texts available is entirely free and self-published by one dude from Cambridge. Like, look at this fucking page! I guarantee you every one of those lecture notes is among the best ever written on its subject. In a few cases, they're practically the only ever written, like the one on the quantum Hall effect I'm working through right now.
This man puts Landau and Lifschitz to shame.