IF

"IF" is also an acronym for Irish Fandom.

IF (also known as Worlds of If) was a digest-sized prozine launched in 1952 by Quinn Publications.

Years	Publisher	Editor(s)
1952 - 1952	Quinn Publications	Paul W. Fairman
1952 - 1953	Quinn Publications	James L. Quinn
1953 - 1954	Quinn Publications	James L. Quinn and Larry T. Shaw
1954 - 1958	Quinn Publications	James L. Quinn
1958 - 1958	Quinn Publications	Damon Knight
1959 - 1961	Galaxy Publishing	H. L. Gold
1961 - 1969	Galaxy Publishing	Fred Pohl
1969 - 1974	UPD	Ejler Jakobsson
1974	UPD	Jim Baen

It was winner of the Best Professional Magazine Hugo for 1966, 1967, and 1968.

IF was merged into Galaxy in 1974. A single issue of a semi-professional revival of IF edited by Clifford Hong was published in 1986.

IF was one of the most successful SF magazines of all time, though it never quite made the front rank. It published many award-winning stories and published Larry Niven's first story, "The Coldest Place".