Which innovative book packaging technique was first introduced with the 1939 release of Ernest Hemingway's 'The Fifth Column and the First Forty-Nine Stories'?

The publishing industry has seen numerous packaging innovations to attract readers and collectors. From dust jackets to creative book boxes, special edition releases, and interactive elements, publishers continually reimagine how literature is presented. This trivia explores a groundbreaking packaging innovation that changed how we experience and collect literature. Test your knowledge of this intersection between literary art and product presentation!

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The first protective book slipcase with embossed author signature
The first transparent acetate dust jacket showing artwork beneath
The first cloth-bound collector's edition with gilt-edged pages
The first numbered limited edition with author's handwritten note inside