Keep digging John. Old Auction House catalogs can be had for decent prices and are loaded with information and images. I would start with Mastros, Lelands, and REA. You may also want to put a want add here in the BST. I would especially look for the 1990's -2005 books.
I know for me, research can be a lot of fun as you stumble onto different things that may be related to other items in your collection. Good luck John, and keep plugging away.
My best, Jimmy