Cities of the Dead: Stories from the Zombie Apocalypse

From Author Wars - https://authorwars.com/publications/cities-of-the-dead-stories-from-the-zombie-apocalypse-431954.html

Overview:

Title: Cities of the Dead: Stories from the Zombie Apocalypse
Author: William Young
Year: 2012
ISBN-10: 9781476460819
Publisher: Smashwords
Price: $2.99
Binding: ebook
Type: Collection
Title Reference: Cities of the Dead: Stories from the Zombie Apocalypse
Notes: Publication date, ISBN and price from the publisher's website.
Because e-books don't have page numbers, #1-20 indicate the order of the stories.
each "day" was available no charge for a limited time as 20 individual ebooks, then when all 20 days were done this was available for no charge for a short time before Halloween