Which pioneering literary subscription service was the first to reach one million subscribers, revolutionizing book distribution in the 20th century?

The literary world has embraced subscription models for centuries, transforming how readers discover and consume books. From the Book-of-the-Month Club founded in 1926 to modern digital subscription services, these models have shaped publishing trends and reading habits. This trivia question explores a fascinating milestone in the evolution of literary subscription services that changed how millions access literature.

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Book-of-the-Month Club (founded 1926)
Literary Guild (founded 1927)
Reader's Subscription (founded 1951)
Great Books Foundation (founded 1947)