...click on the Chipguide Networ link at the top left hand side of this page. You may find scans of the chips you're looking for. I don't know if you need permission to use them for the trade list, but you can always click on "contact" and ask if you may use the scans. Hope this helps.

http://www.chipguide.com/

scans of Nevada chips are at:

http://www.silver-state-treasures.com/