The Walls of Air

From Author Wars - https://authorwars.com/publications/the-walls-of-air-231889.html

Overview:

Title: The Walls of Air
Author: Barbara Hambly
Year: 1983
ISBN-10: 0345296702
Publisher: Del Rey / Ballantine
Price: $2.95
Pages: [6]+297
Binding: Paperback
Type: Novel
Title Reference: The Walls of Air
Notes:
"First Edition: March 1983" No printer's key. "Cover art by David B. Mattingly" on the copyright page. Signature on the artwork. Map artist is uncredited. No signature on the maps. LCCN stated on the copyright page and verified via LoC catalog lookup.