American Academy of Arts and Sciences, Boston, MA - Library symbol - Library of Congress (LCLS)
Automobilvertriebs Aktiengesellschaft - Austria - ICAO designator (FAAC)
Higaonon - Language code (ETLW)
MacBook Air - A computer notebook (XSAL)
Macroblock Address
Main Battle Area (AABC)
Main-Belt Asteroid - Astronomy
Mainhardt-Biehl Associates (SAUO)
Make-or-Buy Authorization (AAG)
Makers of British Art - A publication
Male Bonding Alert - Screenwriter's lexicon
Male Bowhunter Aided - International Bowhunting Organization - Class equipment
Malta Broadcasting Authority (BUAC)
Managed Boot Agent - A software (XSAL)
Management Buy-Out Association (BUAC)
Mantle Bouguer Anomaly - Geology
Manufactured Buildings Association - Defunct (EA)
Many-Body Alloy - Metallurgy
Marching Bands of America (EA)
Marine Biological Association - British
Marine Biological Association of the United Kingdom (BUAC)
Married but Available (TLAA)
Maschhoff, Barr & Associates (ALAC)
Massachusetts Bar Association (EARSL)
Mass Balance Area (NUCP)
Master Bakers' Association - Australia
Master Builders' Association - South Africa (BUAC)
Master Business Administration (SAUO)
Master of Business Administration
Master of the British Arts Association (DBQ)
Material Balance Accounting (SAUO)
Material Balance Area - Nuclear energy
Maximum Benefit Amount - Unemployment insurance
M. B. A Holdings, Inc. - Commercial firm
MB Associates - NCIC firearms make code (NCIC)
MB Associates (SAUO)
Mechlorethamine - War gas - Medicine (EDAA)
Meier Burnout Assessment - Psychology (DHP)
Merion Bluegrass Association - Defunct (EA)
Methods of Biochemical Analysis - Journal - Medicine (EDAA)
Methyl Benzyl Alcohol - Organic chemistry
Methylbis(beta-chloroethyl)amine - Nitrogen mustard - Also, HN, NM - Antineoplastic; war-gas base
Methylbovine Albumin (DMAA)
Methylenebisacrylamide - Organic chemistry
Metropolitan Boxing Alliance (SAUO)
M.G. Bauer Company, Baldwin, ND - Manufacturer code for watercraft hull identification number (USCG)
Michael Brandman Associates - Commercial firm
Microbiological Associates, Inc.
Migratory Bird Act
Military Base Agreement (CINC)
Military Benefit Association (EA)
Milk Bars Association of Great Britain and Ireland Ltd. (BI)
Minimum Burst Altitude (AABC)
Minor Basic Allergens - Immunology
Missouri Broadcasters Association (EARSL)
Model Based Autonomy Group - Ames Research Center (RCD)
Mombasa - Kenya - Airport symbol (OAG)
Monument Builders of America - Later, MBNA
Morgan Business Associates, Inc. - Commercial firm
Mortar Box Assembly
Morten Beyer and Agnew, Inc. - Commercial firm
Mortgage Bankers Association (EA)
Mortgage Bankers Association of America - Washington, DC (EA)
Mortgage Brokers Association (SAUO)
Motor Bearing Assembly (ACAE)
Motorized Bicycle Association - Later, MAA (EA)
Mount Bingar - Australia - Seismograph station code, US Geological Survey - Closed (SEIS)
Multibeam Antenna
Multiple Berthing Adaptor (SSD)
Multiple Birth Association - Australia
Rural Municipality of Argyle Public Library, Baldur, Manitoba - Library symbol - National Library of Canada (NLC)
Woodcock-McGrew-Werder Mini-Battery of Achievement - Test (TMMY)
Yacht and Motor Boat Association (SAUO)
Marimba
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