My favourite is David Wishart's Whisky Classified. It gives a rational classification of whiskies by flavour profiles and not by the inconsistently correlated geographical classification system. Also, you won't agree with everything that any critic thinks, but I nonetheless find Jim Murray's Whisky Bible to be highly useful for world whisky up to date trends, general ideas, and screening purposes. At this point I would probably only agree with Murray maybe 40% of the time on specifics, but the information is defintely useful nonetheless when considering purchases.
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