Question: Which competitor to "Strange Stories" was edited by John W. Campbell?

full_context: Document 1: Strange Stories: Strange Stories was a pulp magazine which ran for thirteen issues from 1939 to 1941. It was edited by Mort Weisinger, who was not credited. Contributors included Robert Bloch, Eric Frank Russell, C. L. Moore, August Derleth, and Henry Kuttner. "Strange Stories" was a competitor to the established leader in weird fiction, "Weird Tales". With the launch, also in 1939, of the well-received "Unknown", "Strange Stories" was unable to compete. It ceased publication in 1941 when Weisinger left to edit "Superman" comic books.
Document 2: Raymond A. Palmer: Raymond Arthur Palmer (August 1, 1910 – August 15, 1977) was an American editor of "Amazing Stories" from 1938 through 1949, when he left publisher Ziff-Davis to publish and edit "Fate Magazine", and eventually many other magazines and books through his own publishing houses, including Amherst Press and Palmer Publications. In addition to magazines such as "Mystic," "Search," and 'Flying Saucers," he published numerous spirtualist books, including "", as well as several books related to flying saucers, including "The Coming of the Saucers," co-written by Palmer with Kenneth Arnold. Palmer was also a prolific author of science fiction and fantasy stories, many of which were published under pseudonyms.
Document 3: Unknown (magazine): Unknown (also known as Unknown Worlds) was an American pulp fantasy fiction magazine, published from 1939 to 1943 by Street & Smith, and edited by John W. Campbell. "Unknown" was a companion to Street & Smith's science fiction pulp, "Astounding Science Fiction", which was also edited by Campbell at the time; many authors and illustrators contributed to both magazines. The leading fantasy magazine in the 1930s was "Weird Tales", which focused on shock and horror. Campbell wanted to publish a fantasy magazine with more finesse and humor than "Weird Tales", and put his plans into action when Eric Frank Russell sent him the manuscript of his novel "Sinister Barrier", about aliens who own the human race. "Unknown"' s first issue appeared in March 1939; in addition to "Sinister Barrier", it included H. L. Gold's "Trouble With Water", a humorous fantasy about a New Yorker who meets a water gnome. Gold's story was the first of many in "Unknown" to combine commonplace reality with the fantastic.
Document 4: Nothing in the Rules: "Nothing in the Rules" is a contemporary fantasy story by American writer L. Sprague de Camp. It was first published in the magazine "Unknown" for July, 1939. It first appeared in book form in the anthology "From Unknown Worlds" (Street & Smith, 1948). It later appeared in the collections "The Reluctant Shaman and Other Fantastic Tales" (Pyramid, 1970), "The Best of L. Sprague de Camp" (Doubleday, 1978), and "Aristotle and the Gun and Other Stories" (Five Star, 2002), as well as the anthologies "The Fantasy Hall of Fame" (Arbor House, 1983), "The Science Fictional Olympics" (Signet, 1984), "Mermaids!" (Ace Books, 1986), "Unknown" (Baen, 1988) and "The Fantasy Hall of Fame" (HarperPrism, 1998) (a different anthology from the 1983 book of the same title). The story has been translated into French, German, and Italian.
Document 5: Science Fantasy (magazine): Science Fantasy, which also appeared under the titles Impulse and SF Impulse, was a British fantasy and science fiction magazine, launched in 1950 by Nova Publications as a companion to Nova's "New Worlds". Walter Gillings was editor for the first two issues, and was then replaced by John Carnell, the editor of "New Worlds", as a cost-saving measure. Carnell edited both magazines until Nova went out of business in early 1964. The titles were acquired by Roberts & Vinter, who hired Kyril Bonfiglioli to edit "Science Fantasy"; Bonfiglioli changed the title to "Impulse" in early 1966, but the new title led to confusion with the distributors and sales fell, though the magazine remained profitable. The title was changed again to "SF Impulse" for the last few issues. "Science Fantasy" ceased publication the following year, when Roberts & Vinter came under financial pressure after their printer went bankrupt.
Document 6: Science Fiction Quarterly: Science Fiction Quarterly was an American pulp science fiction magazine that was published from 1940 to 1943 and again from 1951 to 1958. Charles Hornig served as editor for the first two issues; Robert A. W. Lowndes edited the remainder. "Science Fiction Quarterly" was launched by publisher Louis Silberkleit during a boom in science fiction magazines at the end of the 1930s. Silberkleit launched two other science fiction titles ("Science Fiction" and "Future Fiction) "at about the same time: all three ceased publication before the end of World War II, falling prey to slow sales and paper shortages. In 1950 and 1951, as the market improved, Silberkleit relaunched "Future Fiction" and "Science Fiction Quarterly". By the time "Science Fiction Quarterly" ceased publication in 1958, it was the last surviving science fiction pulp.
Document 7: Columbia Publications: Columbia Publications was an American publisher of pulp magazines featuring the genres of science fiction, westerns, detective stories, romance, and sports fiction. The company published such writers as Isaac Asimov, Louis L'Amour, Arthur C. Clarke, Randall Garrett, Edward D. Hoch, and William Tenn. Operating from the mid-1930s to 1960, Columbia's most notable magazines were the science fiction pulps "Future Science Fiction", "Science Fiction", and "Science Fiction Quarterly". Other long-running titles included "Double Action Western Magazine" (1934–1960), "Real Western" (1935–1960), "Western Action" (1936–1960), "Famous Western" (1937–1960), "Today's Love Stories" (1938–1959), and "Super Sports" (1939–1957). In addition to pulp magazines, the company also published some paperback novels, primarily in the science fiction genre.
Document 8: Science-Fiction Plus: Science-Fiction Plus was a U.S. science fiction magazine published by Hugo Gernsback for seven issues in 1953. In 1926 Gernsback had launched "Amazing Stories," the first science fiction magazine, but he had not been involved in the genre since 1936, when he sold "Wonder Stories". "Science-Fiction Plus" was initially in slick format, meaning that it was large-size and printed on glossy paper. Gernsback had always believed in the educational power of science fiction, and he continued to advocate his views in the new magazine's editorials. The managing editor, Sam Moskowitz, had been a reader of the early pulp magazines, and published many writers who had been popular before World War II, such as Raymond Gallun, Eando Binder, and Harry Bates. Combined with Gernsback's earnest editorials, the use of these early writers gave the magazine an anachronistic feel. Sales were initially good, but soon fell. For the last two issues Gernsback switched the magazine to cheaper pulp paper, but the magazine remained unprofitable. The final issue was dated December 1953.
Document 9: Cosmic Stories and Stirring Science Stories: Cosmic Stories (also known as Cosmic Science-Fiction) and Stirring Science Stories were two American pulp science fiction magazines that published a total of seven issues in 1941 and 1942. Both "Cosmic" and "Stirring" were edited by Donald A. Wollheim and launched by the same publisher, appearing in alternate months. Wollheim had no budget at all for fiction, so he solicited stories from his friends among the Futurians, a group of young science fiction fans including James Blish and C. M. Kornbluth. Isaac Asimov contributed a story, but later insisted on payment after hearing that F. Orlin Tremaine, the editor of the competing science fiction magazine "Comet", was irate at the idea of a magazine that might "siphon readership from magazines that paid", and thought that authors who contributed should be blacklisted. Kornbluth was the most prolific contributor, under several pseudonyms; one of his stories, "Thirteen O'Clock", published under the pseudonym "Cecil Corwin", was very successful, and helped to make his reputation in the field. The magazines ceased publication in late 1941, but Wollheim was able to find a publisher for one further issue of "Stirring Science Stories" in March 1942 before war restrictions forced it to close again.
Document 10: Weird fiction: Weird fiction is a subgenre of speculative fiction originating in the late 19th and early 20th centuries. It can be said to encompass the ghost story and other tales of the macabre. Weird fiction is distinguished from horror and fantasy in its blending of supernatural, mythical, and even scientific tropes. British authors who have embraced this style have often published their work in mainstream literary magazines even after American pulp magazines became popular. Popular weird fiction writers included Edgar Allan Poe, William Hope Hodgson, H. P. Lovecraft, Lord Dunsany, Arthur Machen, M. R. James, and Clark Ashton Smith.
Document 11: From Unknown Worlds: From Unknown Worlds is an anthology of fantasy fiction short stories edited by John W. Campbell, Jr. and illustrated by Edd Cartier, the first of a number of anthologies drawing their contents from the classic magazine "Unknown" of the 1930s-40s. It was first published in magazine format by American company Street & Smith in 1948; the publication was an attempt to determine if there was a market for a revived "Unknown". Street & Smith printed 300,000 copies, against the advice of John Campbell, but although it sold better than the original, too many copies were returned for the publisher to be willing to revive the magazine. The first British edition was issued by Atlas Publishing in 1952; part of the run was issued in a hardcover binding. This edition omitted the story "One Man's Harp.".
Document 12: Analog Science Fiction and Fact: Analog Science Fiction and Fact is an American science-fiction magazine published under various titles since 1930. Originally titled Astounding "Stories of Super-Science", the first issue was dated January 1930, published by William Clayton, and edited by Harry Bates. Clayton went bankrupt in 1933 and the magazine was sold to Street & Smith. The new editor was F. Orlin Tremaine, who soon made "Astounding" the leading magazine in the nascent pulp science fiction field, publishing well-regarded stories such as Jack Williamson's "Legion of Space" and John W. Campbell's "Twilight". At the end of 1937, Campbell took over editorial duties under Tremaine's supervision, and the following year Tremaine was let go, giving Campbell more independence. Over the next few years Campbell published many stories that became classics in the field, including Isaac Asimov's "Foundation" series, A.E. van Vogt's "Slan", and several novels and stories by Robert A. Heinlein. The period beginning with Campbell's editorship is often referred to as the Golden Age of Science Fiction.
Document 13: Worlds Unknown: Worlds Unknown was a science-fiction comic book published by Marvel Comics in the 1970s that adapted classic short stories of that genre, including works by Frederik Pohl, Harry Bates, and Theodore Sturgeon.
Document 14: Weird Tales: Weird Tales is an American fantasy and horror fiction pulp magazine founded by J. C. Henneberger and J. M. Lansinger in March 1923. The first editor, Edwin Baird, printed early work by H. P. Lovecraft, Seabury Quinn, and Clark Ashton Smith, all of whom would go on to be popular writers, but within a year the magazine was in financial trouble. Henneberger sold his interest in the publisher, Rural Publishing Corporation, to Lansinger and refinanced "Weird Tales", with Farnsworth Wright as the new editor. The first issue under Wright's control was dated November 1924. The magazine was more successful under Wright, and despite occasional financial setbacks it prospered over the next fifteen years. Under Wright's control the magazine lived up to its subtitle, "The Unique Magazine", and published a wide range of unusual fiction.
Document 15: Story Paper Collectors' Digest: Story Paper Collectors' Digest was a journal published from November 1946 until May 2005, and with special intermittent issues continuing on until late 2007. It was created by Herbert Leckenby. With articles on story papers, it heavily featured the work of Charles Hamilton, Edwy Searles Brooks and the tales of Sexton Blake. It was published monthly until 2004 . The editors were Herbert Leckenby until his death in October 1959, then Eric Fayne until January 1987 when he retired as editor, then Mary Cadogan.
ground_truth: "Unknown"