Dark Piper

From Author Wars - https://authorwars.com/publications/dark-piper-609677.html

Overview:

Title: Dark Piper
Author: Andre Norton
Year: 1971
Publisher: Ace Books
Price: $0.60
Pages: 220
Binding: Paperback
Type: Novel
Title Reference: Dark Piper
Notes:
- The printing date is not stated. One page of advertising on the back pages is dated 8A-2-71; the other ads are undated.
- Note that Ace bound two other variants of this publication that are nearly identical to this one. The only difference is in the advertising. One variant DRKPPRVHHX1969 uses ads that are undated but seem to be from mid to late 1969. The other (DRKPPR1968) has ads that are dated 8A-2-71, 25-6-71, and 6-71.
- Cover artist credited on copyright page.