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M. Hofferber Books - Specializing in nature, science, how-to, guidebooks, cookbooks and western Americana.
www.webcom.com/outbooks/

Mackus Company - Acquisition and sale of illuminated manuscripts and historical legal documents. Statement of authenticity included.
www.mackusco.com/

Madden Books - Rare, used antique and out of print books, specializing in politics and history including Chinese, Cuban, Soviet and Socialist publications.
www.maddenbooks.com/

Maggs Rare Books - Multi-speciality rare and antiquarian booksellers.
www.maggs.com/

Maremagnum Librorum - Antique, old and out of print books; in English, French, German,Italian and Spanish.
www.maremagnum.com/

Maxwell's Bookmark - Rare and out of print books, including California, Scottish history, genealogy, illustrated books.
www.maxwellsbookmark.com/

Meetinghouse Books - Old, used and out-of-print bookshop; includes world history, literature, cultural studies, arts, and natural history.
www.meetinghousebooks.com/

MemoraDelia - Used science fiction, fantasy and horror books. Plus collectibles, independent press.
www.memoradelia.com/

Michael Ginsberg Books - Western Americana, American History, Canadiana, Voyages and Travel, Bibliography and Reference books.
www.ginsbook.com/

Michael Treloar Antiquarian Booksellers - Particular enthusiasms are modern first editions, cricket ephemera, and North Australiana.
www.treloars.com/

Min's Book Cellar - Gently used books, including homeschooling, children's, parents, families, Christian, fiction and non-fiction.
www.homestead.com/minsbookcellar/

Mitzi Witch's Used Books - Fiction and non-fiction in a variety of areas.
usedbooks.freehosting.net/

Mockingbird Books - Used bookstore with used, rare, out-of-print, and hard-to-find books in all subject areas.
pw2.netcom.com/~mkbird/

ModernRare - Rare, out-of-print, and signed books for collectors, specializing in modern first editions, photography, and one-of-a-kind books.
www.modernrare.com/index.cfm

Moe's Books - Catalogs of out-of-print, new, and antiquarian books in all subject areas updated weekly.
www.moesbooks.com/

MojoMax Books - Rare used books; including classical literature, art, history, Americana, and modern first editions.
www.mojomax.com/index.php

Molly's Bookstore - Out-Of-Print, Rare, and used books.
mollysbookstore.homestead.com/mollysbookstore2.html

Motte And Bailey Booksellers - Specializes in history and science fiction works, variety of general stock as well.
www.mottebooks.com

Mr. Kolk Raamatuantikvariaat - Rare and old books from Estonia. Maps, postcards and prints also available.
www.antikvariaat.ee

Mumfordbooks - Secondhand rare and old books; first editions, out-of-print.
www.mumfordbooks.co.uk/

Mystical Unicorn - On-line shopping for used books, bibliographies and author information.
www.myunicorn.com/