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Ths catalog provides technical and general ordering information for the Standard Reference Materials (SRMs) and Reference Materials (RMs) currently available from the National Institute of Standards and Technology (NIST) Standard Reference Materials Program (SRMP). The materials are arranged according to technical category and classified as follows: Standard Reference Materials for Chemical Composition; Standard Reference Materials for Physical Properties; and Standard Reference Materials for Engineering Materials. Technical descriptions are given for all materials and may include certified values. However, these values are incomplete as they appear in the catalog and therefore cannot be referenced for actual measuement purposes. The certificates issued by the SRMP are the only legitimate sources of certified information for NIST reference materials.