I'll be at Yorktown with a number of books on CD for sale there. I should have "A color guide for insulators" "How to take great digital pictures or eBay" "Shinn System Lightning Rod Catalog" "A collector's guide to telegraph call boxes" "A collector's guide to radio strain insulators both glass and porcelain" and many other telephone, Coca-Cola, farm machinery, and glass catalogs on CD. I even have any 1917 embalmers supply catalog. ALL CDs will be priced at only $10 each and if you can't get to the show I will sell you one here for $10 plus two dollars postage. Thanks for looking.