Which dictionary product's marketing campaign famously revolutionized the industry by using the slogan 'The Dictionary by which all others are measured'?

In the world of language and linguistics, certain products have dramatically shaped how we communicate and learn. Dictionary publishing represents one of the oldest commercial enterprises in the linguistic marketplace, with companies competing to establish the definitive reference works. This trivia question explores a pivotal moment in dictionary marketing history that transformed both the industry and how consumers interact with language resources.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Webster's Third New International Dictionary (1961)
Oxford English Dictionary Compact Edition (1971)
American Heritage Dictionary (1969)
Random House Dictionary of the English Language (1966)