The Twenty-One Balloons

From Author Wars - https://authorwars.com/publications/the-twenty-one-balloons-732708.html

Overview:

Title: The Twenty-One Balloons
Author: William Pène du Bois
Year: Unknown
ISBN-10: 0140320970
Publisher: Puffin
Price: $5.99
Pages: 192
Binding: Trade Paperback
Type: Novel
Title Reference: The Twenty-One Balloons
Notes: Data from Amazon.co.uk as of 2019-09-13.
33rd printing that states "First published by The Viking Books, 1947" over "Published in Puffin Books 1986" over "40 39 38 37 36 35 34 33".
ISBN-10 on copyright page and back cover indicates assumed publication before 1997.
The publisher is stated on the title page as "Puffin Books".
Priced $8.99 in Canada on back cover.
The cover artist credit is stated on the back cover. A signature "BW" is visible in the lower-right corner and has been scanned to Image:Brad Weinman (signature).jpg.
Cover design by Stefanie Rosenfeld.