Magnum Hunter Resources - AMEX symbol (SPSG)
Major Histocompatibility Region - Immunology
Major Homology Region - Biochemistry
Malignant Hyperthermia Resistance - Medicine (DMAA)
Man-Hour
Man Hours Required - Military technology (DDF)
Marine Enterprises, Pittsburg, CA - Manufacturer code for watercraft hull identification number (USCG)
Master of Human Resources
Maternal Heart Rate (MELL)
Maximal Heart Rate (SAUS)
Maximum Heart Rate
McGraw-Hill Ryerson Ltd. - Toronto Stock Exchange symbol
Measurement Handicap Rule - Sailing
Medical Humanities Review - A publication (BRI)
Mehri - Language symbol (ETLW)
Member of the House of Representatives
Methemoglobin Reductase - Hematology and laboratory (DAVI)
Microwave Hologram RADAR
Mile High Radar (SAUS)
Miniature Helium Refrigerator
Missile Hazard Report (AFM)
Mount Hamilton Road - California - Seismograph station code, US Geological Survey (SEIS)
Sacramento, CA - Location identifier - FAA (FAAL)
United States Army Military History Institute, Carlisle Barracks, PA - OCLC symbol (OCLC)
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