Large set includes detailed company histories. Hoover's advanced search options allow creation of lists and rankings by specified categories, among other features. Directory of Corporate Affiliations . Standard and Poor's Register of Corporations, Directors and Executives . Thomas Register of American Manufacturers .
Large set is index to manufacturers by product and type of service.
Ward's Business Directory of U.S. Private and Public Companies . From Tradeport , site lists 55,000 California companies engaged in manufacturing, wholesale, etc. California Manufacturers Register . Lists California based manufacturers by type of product. Directory of California Wholesalers and Service Companies .