I T HAS been definitely established that before any research project is begun, a thorough search of the literature should be made. This is both a time-saving and a dollar-saving procedure. If such a search is not made, time and money are wasted on a problem that may have been previously solved or previously discarded because of lack of evidence to show its practical importance. On the other hand, a search of the literature may indicate the need for further research and so attest to the validity of the problem at hand.
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