C. O. Sylvester Mawson (1870-1938) in 1922 updated and expanded Peter M. Roget's original category sorted thesaurus to create
Roget's International Thesaurus. This is a nice epub version of that work. The category headings are all anchored and linked for easy navigation from an entry back to it's category overview. It also has a very useful table of contents.
I've found the
Project Gutenberg copy clunky, but I've enjoyed using this one.
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