Moon-Dark

From Author Wars - https://authorwars.com/publications/moon-dark-22719.html

Overview:

Title: Moon-Dark
Author: Patricia Wrightson
Year: 1988
ISBN-10: 0689504519
Publisher: Margaret K. McElderry Books
Price: $13.95
Pages: 169
Binding: Hardcover
Type: Novel
Title Reference: Moon-Dark
Notes: 1st US ed. Publ date 1988-04-01 per starred review by Kirkus as Moon Dark, no hyphen (contemporary, posted 2012 with later page-count, ISBN)

Price $11.95 per Locus1 but: $13.95 from reviews Christian Science Monitor 1988-06-13 p23 (as Moon Dark, no hyphen; ages 9 to 12) and Was. Post 1988-05-08 pBO23 (as Moondark, one word; ages 10-up) $13.95 stated front inside flap per one ABEbooks seller 2016-06-01