 In its post-1960 final incarnation, "Bluebook" became a men's adventure magazine, publishing purportedly true stories.In its 1920s heyday, "Blue Book" was regarded as one of the "Big Four" pulp magazines (the best-selling, highest-paying and most critically acclaimed pulps), along with "Adventure", "Argosy" and "Short Stories".The magazine was nicknamed "King of the Pulps" in the 1930s.