Sister Light, Sister Dark

From Author Wars - https://authorwars.com/publications/sister-light-sister-dark-657971.html

Overview:

Title: Sister Light, Sister Dark
Author: Jane Yolen
Year: Unknown
ISBN-10: 0812502493
Publisher: Tor
Price: $3.95
Pages: 252
Binding: Paperback
Type: Novel
Title Reference: Sister Light, Sister Dark
Notes:
• "First mass market edition: September 1989" • Second printing by number line 098765432; except for the change in the number line completely identical to the first printing so likely printed later in 1989 or at latest early 1990 • "Cover art by Dennis Nolan", the artwork has a single initial N • $4.95 in Canada