Fifty Years Hence, or What May Be in 1943

From Author Wars - https://authorwars.com/publications/fifty-years-hence-or-what-may-be-in-1943-760744.html

Overview:

Title: Fifty Years Hence, or What May Be in 1943
Author: Robert Grimshaw
Year: 2018
Publisher: Feedbooks
Price: $0.99
Binding: ebook
Type: Chapter Book
Title Reference: Fifty Years Hence, or What May Be in 1943
Notes:
Data from Amazon.com 2020-02-11 as (no publisher) Print List Price: $4.99 File Size 655 KB Print Length: 57 pages Sold by: Amazon.com Services LLC

Amazon also provides "Look inside" that opens with "front cover" image identical to that linked here, and identifies the publisher.

"About Grimshaw" --between the title screen and dedication-- is a brief biography that cites (http://www.grimshaworigin.org/WebPages/RobtEngr.htm). That page address is now not found at Grimshaw Origins and History.