The hardcover of Digger's Moon is currently ranked 8,388,607 on Amazon.com according to NovelRank's collected data. Published by iUniverse.com, the book's Amazon sales rank has been tracked for a long time, starting on February 16, 2013. In that time, author John W. Heird has seen the book peak at a ranking of 8,388,607. However, NovelRank is not actively tracking the sales rank of this book.
You can view charts and see full ranking and sales data across all worldwide Amazon domains by viewing the full detail page on NovelRank.com.