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Merriam-Webster’s Collegiate Thesaurus Kindle Edition $ 1.99
https://www.amazon.com/Merriam-We…00413QLU0/
Merriam-Webster’s Vocabulary Builder Kindle Edition $ 1.99
https://www.amazon.com/Merriam-Websters-Vocabulary-Builder-Merriam-Webster-ebook/dp/B003IS768K/ [amazon.com]