Which dictionary brand pioneered the 'Dictionary Day' marketing campaign in the 1920s that transformed dictionary sales by positioning their product as essential for social mobility?

In the world of language resources, dictionaries have evolved from simple reference books to branded cultural touchstones. The marketing strategies behind these essential linguistic tools have shaped how we interact with language itself. This trivia question explores a groundbreaking product development campaign that revolutionized how dictionaries were marketed to the public, transforming a reference book into a household necessity through innovative brand storytelling.

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Merriam-Webster
Oxford University Press
Collins
American Heritage