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One of the main difficulties in operating a service for the public is that the public, though very much in evidence individually, may collectively be an unknown quantity. When the service is one offering business and commercial information the difficulties are compounded. The field is fluid, the literature extensive and its acquisition complex. Much of the material quickly becomes out of date. Furthermore, the seeker of business and commercial information has, or may have, many strings to his bow and the part played by any single formal information set up is not obvious.

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