Comics as a print medium have existed in America since the printing of The Adventures of Mr. Obadiah Oldbuck in 1842 in hardcover, making it the first known American prototype comic book. Proto-comics periodicals began appearing early in the 20th century, with the first comic standard-sized comic being Funnies on Parade. Funnies on Parades was the first book that established the size, duration, and format of the modern comic book. Following this was, Dell Publishing's 36-page Famous Funnies: A Carnival of Comics as the first true newstand American comic book; Goulart, for example, calls it "the cornerstone for one of the most lucrative branches of magazine publishing". The introduction of Jerry Siegel and Joe Shuster's Superman in 1938 turned comic books into a major industry and ushered the Golden Age of Comics. The Golden Age originated the archetype of the superhero. According to historian Michael A. Amundson, appealing comic-book characters helped ease young readers' fear of nuclear war and neutralize anxiety about the questions posed by atomic power.