Info on the area about Main Line and Clinton Road

I'm researching a blog post on the Vanderbilt Cup Races Blog about the area about Clinton Road. I dimly remember an Emery Map of the area, and some overhead images of a stone works with sidings south side of the track.

Anyone have any links to info on this area? TIA!

Ah ha! I did find the Emery Map but any other info is still appreciated.