Which dictionary's 1961 marketing campaign revolutionized the industry by focusing on a single linguistic feature that competitors couldn't match?

The dictionary business has seen fascinating marketing strategies over the decades. Publishers have used various techniques to differentiate their products in what might seem like a standardized market. From celebrity endorsements to innovative advertising campaigns, dictionary brands have competed fiercely for market share in both educational and consumer markets. Test your knowledge about a groundbreaking marketing campaign that changed how dictionaries were sold to the public.

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Webster's Third New International Dictionary with its controversial descriptive approach to language
Oxford English Dictionary's campaign highlighting its historical etymology tracking system
American Heritage Dictionary's emphasis on its usage panel of linguistic experts
Random House Dictionary's promotion of its phonetic pronunciation guides