Masters of Atlantis

From Author Wars - https://authorwars.com/publications/masters-of-atlantis-382936.html

Overview:

Title: Masters of Atlantis
Author: Charles Portis
Year: 2010
ISBN-10: 9781585670215
Publisher: Tusk Books / The Overlook Press
Price: $15.95
Pages: 313
Binding: Trade Paperback
Type: Novel
Title Reference: Masters of Atlantis
Notes: Publication date from Amazon UK as of 2011-01-18.
This edition has two different ISBNs and barcodes on the back cover, one below the US/Canada price (ISBN above) and one below the UK price (ISBN 978-0-71564-097-5). The only ISBN listed on the copyright page is for the US/Canada edition, however this publication presumably doubles as the Gerald Duckworth edition as the back cover also states that publisher's website address (www.ducknet.co.uk), though no actual mention of the UK publisher is made anywhere else in this edition.
Also priced £8.99 and $20.00 in Canada.
3rd printing from 1 - 9 number line.