Narrative Threads

We can follow narrative threads through Poul Anderson's Technic History, e.g.:

Ythrians

Merseians in general or Tachwyr in particular

Aycharaych

particular fictional planets

In The Day Of Their Return, Aycharaych, working for the Merseians, imprisons and interrogates an Ythrian on the planet, Aeneas.

The planet, Starkad, is introduced in Ensign Flandry, and Starkadians have been evacuated to Imhotep in The Game Of Empire.

The planet, Talwin, is introduced in A Circus Of Hells and is mentioned as the site of a Terran-Merseian base in The Day Of Their Return and that base is the venue for meetings of Flandry with both Tachwyr and Aycharaych in A Knight Of Ghosts And Shadows.