The Psychotechnic History

Poul Anderson's Psychotechnic History could probably be collected in two omnibus volumes, the first set before the invention of the hyperdrive, the second after. Volume I would begin with "Marius," before space travel, and end with "Brake," on the brink of the Second Dark Ages which, according to the Chronology, begin only thirty years later. Whereas Heinlein's Future History presents indentured servitude on a swampy Venus, the Psychotechnic History presents a bureaucratic dictatorship on a desert Venus. (In an independent work, Anderson presents genocide on an oceanic Venus.)

Volume II would begin with "Gypsy" which introduces the hyperdrive and describes the beginning of the Nomads. Vol II is set almost entirely outside the Solar System. 

In order to include every work listed in the Chronology, Volume I would collect eleven works, Vol II nine - although, for completeness, the latter would incorporate shorter and longer versions of "Virgin Planet." However, there is a question as to whether Anderson intended "The Chapter Ends" to be included in this series. If not and if this story were to be excluded, then Vol II would remain a lengthy and substantial collection and Star Ways/The Peregrine, featuring both the Nomads and the Coordination Service, would make an excellent conclusion or culmination of the series.