Ye'all are having me convince myself that
The Wonderful World of Oz is science fiction too

.
Many similarities to
City; has a robot (the tinman who can talk), animals that can talk (and a man made out of straw that can talk too), mutants (the munchkins), travel over long distances with no description beyond one non-scientific word as to the method (cyclone is the word in one, and rocket is the word in the other), transformation marvels (humans to lopers in one, and heart and brain transplants into humanoids in the other), a great wizard (Oz in one, Juwain in the other), and I am sure there are more.
In fact it would seem that I am now convincing myself that
Oz is even richer science fiction than
City is as it has witches too (plenty of witches in science fiction).