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.

Presses: Fine & Private
(818) 370-3308
Hand set in Meridian, printed letterpress onto Charter Oak. Cover paper, handmade & (more)
Book Dealer: Antiquarian & Rare
(773) 472-4528
Modern First Editions, Radical Literature, Jazz & Blues, African American (more)
Book Dealer: Antiquarian & Rare
(845) 264-7256
Via Biblio.com: mathematics & science; history of science; first-edition fiction (more)