I hate to be obnoxious, but what O'Keeffe did was happen upon a rare book in a small library the he recognized had been written by a semi-famous author. Instead of scanning it (or having it scanned) and putting it on archive.org, then writing his article, he's actively concealing these "new chapters" from the world. My assumption is that he's planning to put it into print in order to make a few bucks.
According to the Google Books entry (which I don't quite trust, because why would there be a Google Books entry?), it's 80 pages, so he'll either have to write a hefty introduction of what seems to be a story about a disabled vet talking about Jesus, or he'll combine the war narrative and the post-war narrative (both obviously long out of copyright) into a single volume and hawk that, and the article he's written will be the introduction.
I guess I advise him to self-publish and to make sure to also target Christian bookstores rather than just academic libraries? Survey a brick and mortar Christian bookstore of possible and get an idea about what covers sell?