It's not an easy job, but someone has to do it: I spent Friday and Saturday in New York City browsing the antiquarian book fairs.

Auction House
+31 23 532 3986
Twice a year (May and November) large auctions of books, manuscripts and art
Book Dealer: Antiquarian & Rare
(954) 270-5783
"Fine books & ephemera of High Quality and Vitality."