The MRS Materials Reference System is a collection of contract administration materials assembled by NALC Headquarters’ Contract Administration Unit. It contains summaries and, in some cases, the full text of many important national-level materials, including settlements of Step 4 grievances, national-level pre-arbitration settlements, memorandums, USPS policy statements, NALC publications and more. The MRS also contains cross-references to significant national and regional arbitration awards.