Future History or "Heinlein Timeline"

Book 4

Astounding Science Fiction, September 1940

John W. Campbell Jr.

Book 8

Astounding Science Fiction, January 1940

John W. Campbell Jr.

Book 19

Astounding Science Fiction, February 1940

Robert A. Heinlein

Book 20

Astounding Science Fiction, July 1940

John W. Campbell Jr.