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Four major improvements have been made in the ZRD-SEARCH-MATCH program [Frevel (1965), Anal. Chem. 37, 471-482]; namely, (1) restriction of the file of standards to the 298 most frequently encountered phases, (2) utilization of a single index file based on the most intense reflection, (3) incorporation of a novel search function, and (4) revision of the quantitative matching of powder patterns.