Frederik Pohl

Pórtico (La Saga de los Heechee 1)

Tras el incierto horizonte (La Saga de los Heechee 2)

El encuentro (La Saga de los Heechee 3)

Los anales de los Heechee (La Saga de los Heechee 4)

The Fifth Science Fiction Megapack

The Last Theorem

1940s Science Fiction - 20 Classic Science Fiction Short Stories From the 1940s: Bold Journeys Into the Unknown From Sci-Fi’s Golden Age

The Tunnel Under The World: The Cost of Knowing the Truth

1950s Science Fiction 12 - 23 Science Fiction Short Stories From the 1950s: Alien Encounters, Time Paradoxes, and Human Reckoning

Lost Sci-Fi Books 286 thru 290 - Five Vintage Sci-Fi Short Stories from the 1930s, 40s, 50s and 60s: Reality, Rockets, and the Dark Wonders of the Universe

The Tunnel Under the World (Unabridged)

1940s Science Fiction 5 - 19 Classic Science Fiction Short Stories From the 1940s: From Bradbury to Bester, Knight to Leinster — A Decade of Wonders