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Winning Concepts in Draw & Lowball by Mason Malmuth is probably the best book out there on lowball.
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The problem is that Mason talks about A-5 lowball with the joker, not 2-7 lowball.
2-7 Triple Draw Lowball is covered by Daniel Negreanu in SuperSystem II. NL 2-7 Single Draw (the beloved Kansas City Lowball) is briefly covered in the original SuperSystem. That's about it for books. Check out the Lowball Gurus website.
Lowball Gurus