For devotees of the used-book store, Los Angeles has quietly become one of the last bastions, for L.A.  has become one of the last great American book towns.  New York may be home to the publishing industry and Lewis Lapham's thesaurus, Chicago still has Saul Bellow, but in both those cities high rents and the Internet have driven many of the venerable used- and rare-book stores out of business.  But here, the book business is thriving.  According to the U.S. 