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This (http://insti.physics.sunysb.edu/~siegel/errata.shtml) is a free (As in Beer and also possibly speech) field theory textbook. So far it's pretty good.

I can't comment on the deeper parts of the book, because I don't get it yet (I don't really have the time atm to slog through a 900 page book, as much as I'd love to)

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