Polesotechnic League, Volume V, And A Later Collection

This inside dust jacket blurb for Poul Anderson's The Earth Book of Stormgate describes the Earth Book as the fifth volume of Anderson's Polesotechnic League series. A fuller description would be that the Earth Book is the fifth and last Polesotechnic League volume and also the second and last Ythrian volume. The Earth Book is a narrative convergence. The Ythrians have their own series comprising the novel, The People of the Wind, and four stories in the Earth Book. They also appear in one League story, "Lodestar," collected in the Earth Book, and finally a single Ythrian appears later in one Terran Empire novel, The Day Of Their Return. 

As the Earth Book completes the first part of Anderson's Technic History, another collection should complete the second part. I now suggest that that final collection should be entitled The Long Night And After. Since the nine Flandry period volumes are about delaying the Long Night, that collection title would inform readers that the Long Night will happen but will not be the end of the story.