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

1971 June WORLDS OF IF Science Fiction Digest Magazine FN 6.0 Philip Jose Farmer

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

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

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

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

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

WORLDS OF IF SCIENCE FICTION JAN-FEB 1971 KEITH LAUMER R A LAFFERTY Vol. 20, No.