The Crystal Cave

From Author Wars - https://authorwars.com/publications/the-crystal-cave-291212.html

Overview:

Title: The Crystal Cave
Author: Mary Stewart
Year: Unknown
ISBN-10: 0449241114
Publisher: Fawcett Crest
Price: $3.50
Pages: 384
Binding: Paperback
Type: Novel
Title Reference: The Crystal Cave
Notes: Stated 30th printing as per number line.
Cover credit from lynn-munroe-books.com's George Ziel index.