That's intriguing! Not many people realize Terry's had a long career as a geologist. I suppose it was just a matter of time before that interest intersected with scripophily. Here's a more specific link to the webpage -- http://www.coxrail.com/coal-background.asp.
I submitted three items for Terry's new coal company database. Figured I'd also post them here for all to see. Two of these are specimen certificates, one (Texas Pacific) from the archives of the American Bank Note Co.
Wow I think I'm gone buy one of those coal certificate for my train layout room, this triple ( actually more than a triple ) will be an amazing scratch build project. Even a coke oven wow and wow The green one are very beautiful