the later editor of which was L. Sprague de Camp. The series led to the first Conan pastiche, the novel The Return of Conan by de Camp and Swedish Howard fan Björn Nyberg. De Camp eventually achieved control over the Conan stories and Conan brand in general. Oscar Friend took over from Kline as literary agent and he was followed by his daughter Kittie West. When she closed the agency in 1965, a new agent was required. De Camp was offered the role but he recommended Glenn Lord instead. Lord began as a fan of Howard and had re-discovered many unpublished pieces that would otherwise have been lost, printing them in books such as Always Comes Evening (1957) and his own magazine The Howard Collector (1961–1973). He became responsible for the non-Conan works and later restored, textually-pure versions of the Conan stories themselves. In 1966, de Camp made a deal with Lancer Books to republish the Conan series, which led to the "First Howard Boom" of the 1970s; their popularity was enhanced by the cover artwork of Frank Frazetta on most of the volumes. Many of his works were reprinted (some printed for the first time) and they expanded into other media such as comic books and films. The Conan stories were increasingly edited by de Camp and the series was extended by pastiches until they replaced the original stories. In response, a puristic movement grew up demanding Howard's original, un-edited stories. The first boom ended in the mid-1980s. In the late 1990s and early 21st century, the "Second Howard Boom" occurred. This saw the printing of new collections of Howard's work, with the restored texts desired by purists. As before, the boom led to new comic books, films and computer games. Howard's house in Cross Plains has been converted into the Robert E. Howard Museum, which has been added to the National Register of Historic Places. Adaptations The works of Robert E. Howard have been adapted into multiple media, such as the two Conan films released in the 1980s starring Arnold Schwarzenegger, and another in 2011 starring Jason Mamoa. In addition to the Conan films, other adaptations have included Kull the Conqueror (1997) and Solomon Kane (2009). In television, the anthology series Thriller (1961) led the adaptations with an episode based on the short story "Pigeons from Hell". The bulk of the adaptations have, however, been based on Conan