Series
Ace SF
We don't know whether this one is finished.
Nobody has confirmed the status of this series yet. That's a gap in our data, not a verdict on the books.
2 books here · 1925–1977
Publication order
This is publication order — nobody has confirmed a different reading order for this one yet.
—
The Moon Men
1925 · Edgar Rice Burroughs
—
Alien embassy
1977 · Ian Watson