The Door Into Shadow

From Author Wars - https://authorwars.com/publications/the-door-into-shadow-38599.html

Overview:

Title: The Door Into Shadow
Author: Diane Duane
Year: 1985
ISBN-10: 0812536738
Publisher: Tor
Price: $2.95
Pages: xii+298
Binding: Paperback
Type: Novel
Title Reference: The Door Into Shadow
Notes:
- stated: "First TOR printing: June 1985"
- No number line present
- "Printed in the United States of America"
- Canadian price of C$3.50, and caniadian ISBN (0-812-53674-6) on front cover and spine.
- Actual printed map credit is "Duane, after D'Welcaen and Lhhw Ehs Pheress", the latter two are fictional charqcters, the 2nd being a dragon. The map carries a note: "Topographical data checked by overflight". The map appears to be identical or very similar to a map in The Door into Sunset