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John-Henri Holmberg, editor. Häpna! En bok ur och om 1950-talets tongivande science fiction-magasin ["Häpna! A Book of and about the Leading Science Fiction Magazine of the 1950s"] (Stockholm, Sweden: Heidi, 2015) [nonfiction: anth: with historical and critical comments plus a complete index: Häpna!: hb/Frank R Paul cover of #1]