Which dictionary publisher pioneered the 'thumb index' packaging innovation that revolutionized dictionary navigation and became a standard retail feature?

Dictionary publishers have revolutionized their retail strategies and packaging design over the decades to keep physical dictionaries relevant in the digital age. Test your knowledge about how these language authorities have evolved their retail presence and marketing approaches to maintain their position as guardians of language while adapting to changing consumer preferences.

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Merriam-Webster
Oxford University Press
Collins
Chambers