Edited, with an introduction, afterword, and essays about the stories by Frederik Pohl. Stories include: Trouble in Time; Mars-Tube; Critical Mass; The World of Myrion Flowers; The Engineer; A Gentle Dying; Nightmare with Zeppelins; The Quaker Cannon; Gravy Planet (Excerpt); Mute Inglorious Tam (19th place, 1975 Locus Poll Award, Best Short Story); The Gift of Garigolli (15th place, 1975 Locus Poll Award, Best Novelette); The Meeting (winner, 1973 Hugo Award; 1973 Locus Poll Award; 9th place, Best Short Fiction).
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