I've just put John Henry: A Folk-Lore Study by Louis Chappell, 1932 on my site here: http://www.bluegrassmessengers.com/john-henry-a-folk-lore-study--louis-chappell-1932.aspx
There are a number of texts and I've included commentary and images from my painting of John Henry. Here's the the Intro: http://www.bluegrassmessengers.com/introduction--chappell-1932.aspx
The texts are found in the Appendix: http://www.bluegrassmessengers.com/appendix-texts--chappell-1932.aspx
Chappell's book (1932) followed Guy Johnson's (1929) and both men concluded that the event took place in the Big Bend Tunnel in West Virginia. The painting is based on the Alabama origin detailed by John Garst who helped me with the painting. Both Johnson and Chappell mention the Alabama origin but neither took the time to investigate it properly.