Roget's International Thesaurus by Peter Mark Roget (1977)

Fourth Edition - Complete & UnabridgedRoget's International Thesaurus is the most comprehensive and useful thesaurus available today.It is a true thesaurus. It remains faithful to the original system of word association put forward by Dr. Peter Mark Roget in the 19th century - a concept that has proved so fundamental and valuable that it is being used in research to simulate human intelligence in computers. This Fourth Edition of Roget's International Thesaurus is:• Expanded and updated• Easy to use• Broader in scope• Time-tested format• Useful usage guidance