Pete And Joe On Nerthus

Poul Anderson's juvenile hero, Wilson Pete, solves two mysteries on the colony planet, Nerthus:

What is the ecological role of the tinklers?
Are there intelligent natives?

The alien says, "'...call me Joe.'" (The Complete Psychotechnic League, Volume 3, p. 23), the title of another Anderson story. See here. He claims to be from "Astan IV," which would mean the fourth planet of a star called "Astan." Pete makes an insightful deduction from this name. We, reading later, recall the spy, Aycharaych, claiming to be from the planet, Jean-Baptiste. Nerthus reappears in "Virgin Planet"/Virgin Planet and in The Peregrine.

Volume 3 is in any case incomplete because it excludes The Peregrine. The Psychotechnic History needs to be called that, not The Psychotechnic League, and, I suggest, should be collected in two omnibus volumes:

I, ten works, pre-FTL;
II, eleven works, FTL.