"Ain’t Nothing but a Man is a 60-page version of Nelson’s 200+ page book for adults. Every page has photographs or drawings to show locations and people of the post-Civil War era, and to illustrate what the railroad slang from the songs mean. 

In “How to be a Historian” the co-author, Marc Aronson, lists the six stages of Nelson’s search:

https://plumfieldmoms.com/plumfield-moms-picture-book-reviews/aint-nothing-but-a-man-my-quest-to-find-the-real-john-henry