Barnes & Noble Rattles Industry By Buying Top Book Wholesaler
Barnes & Noble, nation's largest bookseller, announces $600 million purchase of the leading wholesaler, Ingram Book Group; deal is denounced by American Booksellers Assn, which will demand a Federal antitrust investigation, and by Authors Guild; acquisition will give company access to 11 distribution centers, which will help it cut costs and reduce delivery time for its growing base of on-line customers (M)