1968 Nov WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Roger Zelazny

1968 Sept WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Hal Clement

1967 June WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Andre Norton

1971 Aug WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Theodore Sturgeon

1969 July WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Keith Laumer

1969 May WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Robert Bloch

1971 Jan/Feb WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Hayden Power

1957 Dec WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Robert Silverberg