First here: http://thedentedhelmet.com/misc/tdh_ref/
Then through some sleuthing, I found http://thedentedhelmet.com/reference but all those sites no longer exist.
Where do I find this now?
Are you talking about the gallery?
Use the "gallery" button in the bar at the top of the page. Right between "forum" and "wiki."
All the reference images are inside.
(I think that's what you're talking about.)