Can someone please define 'pulp' because the only definition I know is what's left when you juice an orange...
Pulp is a genre of magazines that became popular in the 1930s and 40s, and is called that because the books were printed on cheap "pulp" paper, as opposed to the glossy or slick printing of "higher quality" magazines. They were often adventure or detective style stories. They were text stories, which differentiates them from comics which were in similar magazines of the time but were, well comic format.
Conan The Barbarian, Buck Rogers, Solomon Kane, John Carter were all big names in pulp.
The genre made its way into radio, most notably exemplified by the Shadow.
Although no longer the traditional "pulp" because the printing methods changed, the genre itself lived on into the 50s and turned more to alien invaders and sci-fi elements.