The Four Amber Novels

From Author Wars - https://authorwars.com/publications/the-four-amber-novels-503822.html

Overview:

Title: The Four Amber Novels
Author: Roger Zelazny
Year: Unknown
Publisher: Avon
Price: $6.00
Pages: 175+223+192+188
Binding: Paperback
Type: Omnibus
Title Reference: Sign of the Unicorn
Notes: Box set containing the first four books of the Chronicles of Amber (Corwin).
Nine Princes in Amber 9th printing
The Guns of Avalon 6th printing
Sign of the Unicorn 5th printing
The Hand of Oberon 4th printing