(1957) D-227 SF H. Beam Piper and John J. McGuire Crisis in 2140 / Cyril Judd Gunner Cade (1957) D-237 SF Robert Silverberg Master of Life and Death / James White The Secret Visitors (1957) D-242 SF A. E. van Vogt Empire of the Atom / Frank Belknap Long Space Station #1 (1957) D-249 SF Philip K. Dick The Cosmic Puppets / Andre Norton (as Andrew North) Sargasso of Space (1957) D-255 SF Kenneth Bulmer City Under the Sea / Poul Anderson Star Ways (1957) D-266 SF E. C. Tubb The Mechanical Monarch / Charles L. Fontenay Twice Upon A Time (1958) D-277 SF Murray Leinster City on The Moon / Donald A. Wollheim (ed.) Men on The Moon (1958) D-286 SF Robert Silverberg Invaders From Earth / Donald A. Wollheim (as David Grinnell) Across Time (1958) D-291 SF Robert Silverberg (as Calvin M. Knox) Lest We forget Thee, Earth / Raymond Z. Gallun People Minus X (1958) D-295 SF Jack Vance Big Planet / The Slaves of The Klau (1958) D-299 SF Andre Norton Star Born / H. Beam Piper and John J. McGuire A Planet for Texans (1958) D-303 SF Poul Anderson The Snows of Ganymede / War of the Wing-Men (1958) D-311 SF Robert Silverberg Stepsons of Terra / Lan Wright A Man Called Destiny (1958) D-315 SF Eric Frank Russell The Space Willies / Six Worlds Yonder (1958) D-322 SF Robert Moore Williams The Blue Atom / The Void Beyond and Other Stories (1958) D-331 SF Kenneth Bulmer The Secret of Zi / Ray Cummings Beyond the Vanishing Point (1958) D-335 SF Poul Anderson The War of Two Worlds / John Brunner Threshold of Eternity (1959) D-345 SF Andre Norton (as Andrew North) Plague Ship / Voodoo Planet (1959) D-351 SF Edmond Hamilton The Sun Smasher / Robert Silverberg (as Ivar Jorgenson) Starhaven (1959) D-358 SF Robert Silverberg (as Calvin M. Knox) The Plot Against Earth / Milton Lesser Recruit for Andromeda (1959) D-362 SF John Brunner The 100th Millennium / Donald A. Wollheim (as David Grinnell) Edge of Time (1959) D-369 SF Brian W. Aldiss Vanguard From Alpha / Kenneth Bulmer The Changeling Worlds (1959) D-375 SF Damon Knight Masters of Evolution / George O. Smith Fire in the Heavens (1959) D-381 SF Jerry Sohl One Against Herculum / Andre Norton Secret of the Lost Race (1959) D-385 SF John Brunner Echo in the Skull