Future History or "Heinlein Timeline" is a 11-book series with 11 primary works first released in 1940 with contributions by Robert A. Heinlein, Miguel Blanco, and 10 others.
1951 • 19 Readers • 189 pages • 3.1
1940 • 1 Reader • 160 pages • 4
1963 • 45 Readers • 3.1