Summits

There are two kinds of future histories: Wellsian/Stapledonian and Heinleinian. Poul Anderson's History of Technic Civilization is a summit of Heinleinian future history writing. Anderson's Genesis is a partial synthesis of Heinleinian and Stapledonian future history models.

There are two directions of time travel, past and future, and two time travel paradoxes, circular causality and causality violation. Anderson's Time Patrol series is a summit of historical causality violation time travel fiction that also incorporates circular causality. 

Time Patrol is to the Time Patrol series what The Earth Book Of Stormgate is to the early Technic History. Time Patrol collects everything that is not in The Shield Of Time. The Earth Book collects nearly everything that was not in five previous volumes. Time Patrol and The Shield Of Time are to the Time Patrol series what the seven-volume The Technic Civilization Saga is to the Technic History, i.e., everything.

Wells' Time Traveller experiences the future of mankind and Earth. Anderson's Time Patrolmen experience real and alternative histories.