1957, by Edmund Emshwiller

If was science fiction magazine that was published from 1952 to 1974, by Quinn Publications.  Though If was never more than a modest success as far as sales went, it still published work from authors like Harlan Ellison, Robert A. Heinlin, and Larry Niven.  It also featured some of the best covers in the business.  Here are a few of the covers of If magazine:

1952, by Henry Jones

1952, by Martin Key

1952, by Ralph Joiner

1952, by Ralph Joiner

1954, by Ken Fagg

1955, by Frank Kelly Freas

1959, by Frank Kelly Freas

1959, by John Pederson

1959, by John Perderson

1962, by Virgil Finlay

1965, by Richard McKenna