If magazine was a monthly science fiction magazine that was first published in 1952, and ran through 1974, before it was merged with its sister publication, Galaxy Science Fiction.
The magazine was moderately successful, though it was never regarded as one of the top tier of science fiction magazines and didn't meet with the same success as that of other magazines such as Astounding Science Fiction, The Magazine of Fantasy & Science Fiction or Galaxy Science Fiction.
It achieved its greatest success under editor Frederik Pohl, winning the Hugo Award for best professional magazine three years running from 1966 to 1968. Under Pohl If took on its own identity. Initially it had played second fiddle to Galaxy, but whereas Pohl kept the more select stories for that magazine, he turned If into a magazine for more adventurous and exciting sci-fi. Before long it was If that proved the more popular.
If was merged into Galaxy Science Fiction after the December 1974 issue, which was its 175th issue overall.
Now you can read online and download the entire run of If HERE thanks to the people over at Internet Archive.
----- --- ------