(THE BLAZE) — As Amazon works to purge its online shopping site of all things Confederate flag, it seems a nonfiction historical book has gotten caught in the crossfire.

Michael Dreese is a Pennsylvanian author who writes nonfiction, historical books predicated on the Battle of Gettysburg. Among his books include one about the Union battle flag and one about the Confederate battle flag, the latter of which seems to have been deemed inappropriate by Amazon.

According to Dreese, he recently received an email from Amazon that informed him that one of his products violated the restrictions the company had placed on Confederate flag merchandise. That product, he said, is his book, “This Flag Never Goes Down!: 40 Stories of Confederate Battle Flags and Color Bearers at the Battle of Gettysburg,” published in 2004.

Read more at http://www.wnd.com/2015/07/confederate-flag-author-vanishes-from-amazon/#fWkrCStEFXVcIqGc.99