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MMSSMichigan Math and Science Scholars
MMSSMalaria Medicines & Supplies Services (WHO)
MMSSMarketing Management Support System
MMSSMonash Marketing Students Society
MMSSMast Mounted Sight System
MMSSMaster Milestone Summary Schedule
MMSSMulti-Media and Strategic Services (Sprint)
MMSSMulti-Media Speaker System
MMSSMembership Marketing Support Services
MMSSMaritime Mobile Satellite Service
MMSSMathematical Methods in the Social Sciences