Sotheby's - The New York branch of the international auction house. www.sothebys.com/cgi-bin/osform.exe/sothebys?osforms_template=officeView.oft&AuctionLocationOID=2|644848
Swann Galleries Auctioneers - Auctions of rare and antiguarian books, maps and atlases, autographs and manuscripts, photographs, prints and drawings, and vintage posters. www.swanngalleries.com/index.cgi
William Doyle Galleries - Arts auctions and appraisals. Online catalogues and sale results. www.doylegalleries.com/home