The Keystone Mine

From Author Wars - https://authorwars.com/books/the-keystone-mine-2048991.html

Overview:

Title: The Keystone Mine
Author: John M. Campbell
Year: 2016
Type: Short Fiction

Editions/Publications:

2016 . Keystone Chronicles (2016, John M. Campbell, Third Flatiron Publishing, ISBN-10: 9780692766712, $8.99, 184 pages, Trade Paperback, Anthology)
2016 . Keystone Chronicles (2016, John M. Campbell, Third Flatiron Publishing, ISBN-10: 9781311097644, $3.99, ebook, Anthology)