If you have possible Lincoln document you want appraised or sold, contact a dealer in rare/used books or Lincolniana. You can visit an online buy-and-sell service at The Railsplitter. Also see the dealers listed under Lincoln Bookstores. Or, you can email Kent Tucker of Illinois, an appraiser of Lincolniana. To look up all sorts of Lincoln collectibles, consult Collecting Lincoln With Values by Stuart Schneider (Atglen, PA: Schiffer Publishing Co., Ltd, 1997). This book is available in public libraries and through Inter-Library Loan.