Frederik Pohl

Pórtico (La Saga de los Heechee 1)

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

Los exploradores de pórtico (La Saga de los Heechee 5)

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 (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

1940s Science Fiction 4 - 16 Classic Science Fiction Short Stories From the 1940s: From Martian Duels to Time Twists—1940s Sci-Fi at Its Best

Lost Sci-Fi Books 251 thru 260 - Ten Vintage Sci-Fi Short Stories from the 1930s, 40s, 50s and 60s

Lost Sci-Fi Books 251 thru 255 - Five Vintage Sci-Fi Short Stories from the 1930s, 40s, 50s and 60s