The Best Future History Omnibus Collection

A future history can be a single novel, e.g.:

The Shape Of Things To Come by HG Wells;
Last and First Men by Olaf Stapledon;
A Short History Of The Future by RC Churchill;
Genesis by Poul Anderson -

- or a single collection, e.g.:

Galaxies Like Grains Of Sand by Brian Aldiss;
The Seedling Stars by James Blish;
Tales Of The Flying Mountains by Poul Anderson -

- or a single omnibus volume, e.g.:

The Past Through Tomorrow by Robert Heinlein;
Cities In Flight by James Blish;
potentially, the Rustum History by Poul Anderson -

or may be too long to fit into a single volume, e.g.:

the Robots and Empire History by Isaac Asimov;
the Known Space History by Larry Niven;
the CoDominium History by Jerry Pournelle;
the History of Technic Civilization by Poul Anderson;
the Harvest of Stars History by Poul Anderson.

We have cited five examples by Anderson but have not yet exhausted the full list of this single author's future histories. Known Space and the Technic History each have a representative collection:

Tales Of Known Space;
The Earth Book Of Stormgate.

The Earth Book is an omnibus collection of eleven stories and one novel with new introductory passages. It introduces or incorporates many aspects of the History and even anticipates the Dominic Flandry series by introducing Merseia and mentioning the Empire. Thus, it is a remarkably comprehensive future history omnibus collection.