In 2006 Crystal named his top ten books on the English language for the Guardian, including:
Roget's Thesaurus of English Words and PhrasesRead about another entry on Crystal's list.
No name has come to be more synonymous with "thesaurus" than Roget's. He has even become a common noun: I have "a Roget" on my shelves. Indeed I have a dozen Rogets, as his thesaurus has now appeared in numerous editions, and has been revised, expanded, and abridged more times than any other. It was a truly remarkable work for its period, and anyone who has tried to update it or rework its content (as I have) cannot fail to recognise the enormous labour that went into its compilation. It is the best first source of reference we have for those many occasions when we are dimly aware of the meaning we want to express and are searching for the best word with which to express it.