Madden Books
Rare, used antique and out of print books, specializing in politics and history including Chinese, Cuban, Soviet and Socialist publications.
Maremagnum Librorum
Antique, old and out of print books; in English, French, German,Italian and Spanish.
Maxwell's Bookmark
Rare and out of print books, including California, Scottish history, genealogy, illustrated books.
MemoraDelia
Used science fiction, fantasy and horror books. Plus collectibles, independent press.
Michael Ginsberg Books
Western Americana, American History, Canadiana, Voyages and Travel, Bibliography and Reference books.
Motte And Bailey Booksellers
Specializes in history and science fiction works, variety of general stock as well.
Mr. Kolk Raamatuantikvariaat
Rare and old books from Estonia. Maps, postcards and prints also available.
Mystical Unicorn
On-line shopping for used books, bibliographies and author information.