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HOH1, then Theory of poker.
You're putting the cart before the horse. In pretty much any subject you want a solid foundation before you move on to more complex matters. Harrington on Hold 'em is an awesome book, but although much of it's contents can be applied to cash games, it focuses solely on tournament play. Theory of Poker covers all the essentials of poker. It concepts apply to all games and limits and also to tournaments. If you only could buy one book you'd be much better served buying Theory of Poker.