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The majority of endeavours of merit are subject to continuing evolution and development. Although one may not always favour the results of such developments, nevertheless, frequently they transform the impossible of yesterday into the commonplace of today. In these regards the information function is no exception. The advances made to services, sources and systems during the past 25 years have been quite tremendous. There is no reason in fact to expect that the rate of change in the future will be any the less than that which we, or some of us, have experienced.

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