Which innovative book packaging format, introduced in the 1930s, revolutionized literature accessibility by making books more affordable and portable for mass audiences?

In the publishing industry, book packaging and presentation have evolved dramatically over the centuries, influencing reader engagement and sales. From dust jackets to digital covers, innovations in book packaging have shaped how literature is marketed and consumed. This trivia tests your knowledge about a revolutionary packaging technique that transformed the accessibility and popularity of literature in the 20th century.

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Paperback books (mass market)
Leather-bound collector's editions
Audio book recordings on vinyl
Illustrated dust jackets for hardcovers