The Blue Giraffe
L. Sprague de Camp
Reverie
Arthur C. Clarke
Heavy Planet
E. V. Lucas & Milton A. Rothman
Life-Line [original version]
Robert A. Heinlein
Future History (1)
Life-Line
Thrilling Adventures 1939-08 v30n03
Thrilling Adventures
Astounding Science-Fiction (UK)1939-08
Astounding Stories (UK)
Thrilling Wonder Stories 1939-08 v14n01
Thrilling Wonder Stories
Astounding Science Fiction 1939-07 v23n05
Astounding Stories
Fantastic Adventures 1939-07 v01n02
Fantastic Adventures
Amazing Stories 1939-07 v13n07
Amazing Stories
Trends
Isaac Asimov
The Scientists Revolt
Edgar Rice Burroughs & Ray Palmer
Nothing in the Rules
Greater Than Gods
C. L. Moore
Black Destroyer
A. E. Van Vogt
Space Beagle (1)
Startling Stories 1939-07 v02n01
Startling Stories
Futuria Fantasia 1939-06 v01n01
Futuria Fantasia
Astounding Science-Fiction 1939-06 v23n04
Amazing Stories 1939-06 v13n06