The major event many cite as marking the beginning of the Golden Age was the 1938 debut of Superman in Action Comics #1, published by the predecessor of modern-day DC Comics. The creation of Superman made comic books into a major industry. Some date the start to earlier events in the 1930s: The Overstreet Comic Book Price Guide‘s regular publication The Golden Age Quarterly lists comic books from 1933 onwards (1933 saw the publication of the first comic book in the size that would subsequently define the format); some historians, such Roger Sabin, date it to the publication of the first comic books featuring entirely original stories rather than re-prints of comic strips from newspapers (1935) by the company that would become DC Comics.
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