Sotheby's - The New York branch of the international auction house. - http://www.sothebys.com/app/live/office/OfficeAuction.jsp?office_id=2
William Doyle Galleries - Arts auctions and appraisals. Online catalogues and sale results. - http://www.doylegalleries.com/
Swann Galleries Auctioneers - Auctions of rare and antiguarian books, maps and atlases, autographs and manuscripts, photographs, prints and drawings, and vintage posters. - http://www.swanngalleries.com/index.cgi
Christie's - The New York headquarters. Online catalogues. - http://www.christies.com/home_page/home_page.asp