Ars Libri
Carries books on fine art and illustrated books.
http://www.arslibri.com/

Artext
Online bookstore, based in Cambridge, Massachusetts, that specializes exclusively in antiquarian, new and out-of-print books on 19th and 20th Century Art and on Film.
http://www.artextbooks.com/

Cohen - [J.M. Cohen, Rare Books, ABAA]
Books on the Decorative and Applied Arts.
http://www.jmcohenrarebooks.com/

Colin Martin Books
Out-of-print art and design books, from primitive to contemporary art.
http://www.colinmartinbooks.com/

Colophon Page
Specializes in art, photography and illustrated books related to the avant-garde movements.
http://colophon.com/toc.html

Han-Shan Tang Books
The West's foremost bookseller specializing in the art and archaeology of Far East Asia (China, Japan, Korea), Southeast Asia, Central Asia and South Asia.
http://www.hanshan.com/

Kauai Fine Arts
Outstanding collection of maps and prints from around the world.
http://www.brunias.com/

Leonard Fox Rare Books
Books and portfolios from a variety of periods and schools including Art Nouveau, Art Deco, Cubism, Contemporary, Modernism, Seccessionism, Pop Art and Surrealism. New York dealer.
http://www.foxrarebooks.com/

Mahoney's Books, Violins and Bows
Rare books and periodicals on the violin family of musical instruments.
http://www.violinsandbows.com/

Russell R. duPont
Books, catalogues, and reference materials; artists monographs; as well as furniture; silver; textiles, and pottery.
http://www.dupontbooks.com/

Simon Gough Books
Secondhand and antiquarian titles, specializes in art and illustrated books.
http://www.simongoughbooks.com/Default.htm

Starosciak Art Books
Specializes in art, architecture, decorative, and textile arts titles.
http://www.artbooks-ltd.com/

Sullivan Goss Books and Prints Ltd.
Specializes in artist catalogue raisonnes, fine prints, vintage photography, and California paintings.
http://www.sullivangoss.com/