There are 3 books in the The Iron Dragon's Daughter Series series. The newest book is The Iron Dragon's Mother which came out in 2019.

1
The Iron Dragon's Daughter

Book cover of The Iron Dragon's Daughter
Named a NEW YORK TIMES notable book of 1994, THE IRON DRAGON'S DAUGHTER tells the heartrending story of a changeling child who is kidnapped to a realm of malls and machines and enslaved in a vast, infernal factory. Ultimately she escapes and attempts to educate herself about this alien world,…
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2
The Dragons of Babel

Book cover of The Dragons of Babel
A fantasy masterpiece from a five-time Hugo Award winner! A war-dragon of Babel crashes in the idyllic fields of a post-industrialized Faerie and, dragging himself into the nearest village, declares himself king and makes young Will his lieutenant.  Nightly, he crawls inside the young fey's brain to get a measure…

3
The Iron Dragon's Mother

Book cover of The Iron Dragon's Mother

A 2020 LOCUS AWARD FINALIST AND KIRKUS BEST SCIENCE FICTION AND FANTASY OF 2019

Award-winning author Michael Swanwick returns to the gritty, post-industrial faerie world of his New York Times Notable Book The Iron Dragon’s Daughter with the standalone adventure fantasy The Iron Dragon’s Mother.

Caitlin of House Sans Merci…