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- M: 190 terms
- Macao (Macau). Aomen (Ao-men)
- Macedonia. Former Yugoslav Republic of Macedonia. Republika Makedonija
- Macedonian
- Macedonian language
- Macedonian literature
- Machine elements. Motive power engineering. Materials handling. Fixings. Lubrication
- Machine-readable documents
- Machines according to motive power, propulsive force. Source of energy of machine
- Machines and mechanical apparatus
- Macro-Chibchan languages
- Macromolecular materials. Rubbers and plastics
- Madagascar. Democratic Republic of Madagascar. Repoblikan'i Madagasikara
- Magmatic rocks. Igneous rocks
- Magnetism
- Magnetism. Electromagnetism
- Mahatmas. Gurus. Wise men
- Mahayana Buddhism. The great vehicle
- Main ingredients for the blending of drinks. Fruit and vegetable juices. Syrups. Liqueurs. Soft drinks
- MAIN TABLES
- Making and mending of clothes at home. Domestic dressmaking
- Malacca (Aslian) group
- Malawi. Republic of Malawi
- Malay (Bahasa Indonesia; Bahasa Malaysia)
- Malayo-Polynesian languages
- Malaysia. Federation of Malaysia. Persekutuan Tanah Malaysia
- Maldives. Republic of the Maldives. Divehi Rājjey ge Jumhuriyyā
- Male persons. Men
- Mali. Republic of Mali. République du Mali
- Malta. Republic of Malta. Repubblika ta' Malta
- Mammalia (Mammals)
- Mammalia. Fossil mammals
- Man's relation to god(s)
- Man-made fibres
- Man. Mankind. Humanity. Doctrinal anthropology
- Management
- Management activities
- Management agents. Mechanisms. Measures
- Management aspects of educational institutions
- Management conditions. Factors
- Management operations. Direction
- Management theory
- Manner of contest. Combative style. Strategy. Tactics
- Manufacture of coins and medals. Minting
- Manufactured mineral-based materials
- Manuscripts
- Manuscripts. Rare and remarkable works
- Mapuche (Mapudungun)
- Marathi
- Maritime canals. Ship canals
- Marketing of forest products. Economics of forest transport and the wood industries
- Marketing. Sales. Selling. Distribution
- Marks of ownership or origin
- Marriage and family
- Marsupialia (Marsupials)
- Martyrs
- Mascarene Islands
- Masonry and related building crafts
- Mass communication. Informing, enlightening of the public at large
- Material and equipment of naval forces. Protection and armament of vessels. Submarine defences
- Material bases of life. Biochemistry. Molecular biology. Biophysics
- Materials of mainly organic origin
- Materials testing. Commercial materials. Power stations. Economics of energy
- Materials, characteristics, processes and equipment
- Mathematical and applied linguistics. Phonetics. Graphemics. Grammar. Semantics. Stylistics
- Mathematical crystallography. Continuum theory of crystals
- Mathematical cybernetics
- Mathematical economics
- Mathematical linguistics
- Mathematical logic
- Mathematical programming
- Mathematics
- MATHEMATICS. NATURAL SCIENCES
- Mauritania. Islamic Republic of Mauritania. Mūrītāniyā. Al-Jumhūriyyah al-Islāmiyyah al-Mūrītāniyyah
- Mauritius. Republic of Mauritius. Repiblik Moris. République de Maurice
- Meals and mealtimes. Tableware
- Means of producing signs and scripts
- Measurement of geometric and mechanical quantities: instruments, methods and units
- Measurement of heat quantity. Calorimetry
- Measurement of weight, mass. Measurement of volume
- Measurement principles, methods, techniques. Instrumentation
- Measures against industrial and other nuisances
- Mechanical energy. Conservation of mechanical energy
- Mechanical engineering in general. Nuclear technology. Electrical engineering. Machinery
- Mechanical technology in general: processes, tools, machines, equipment
- Mechanical treatment for solidification of fuels. Briquetting
- Mechanics
- Mechanics of gases. Aeromechanics. Plasma physics
- Mediaeval art (Christian, Islamic art)
- Medical instruments and equipment in general
- Medical sciences
- Medicaments according to their origin
- Medicaments according to their principal action
- Medo-Persia
- Melanesia. States and regions of Melanesia
- Memory characteristics
- Memory system
- Memory units. Storage units
- Mental development and capacity. Comparative psychology
- Mercantile marine penal law. Penal and disciplinary regime in merchant navy
- Messiah(s)
- Metal arts
- Metallic compounds in general. Salts. Mineral compounds
- Metallurgy
- Metals
- Metals in general
- Metamorphic rocks
- Metaphysics
- Metaphysics of spiritual life
- Metatheria
- Meteorites
- Meteorology
- Methodology
- Methodology of history. Ancillary historical sciences
- Methodology of linguistics. Methods and means
- Methods of the social sciences
- Metrology. Weights and measures in general
- Mexico. Central American states. Caribbean territories
- Mexico. United Mexican States. México (Méjico). Estados Unidos Mexicanos
- Miao-Yao languages
- Microbial morphology
- Microbial physics, chemistry, metabolism, catabolism
- Microbial physiology
- Microbial techniques
- Microbiological industries. Science and technique of applied microbiology. Applied mycology
- Microbiology
- Micronesia. States and regions of Micronesia
- Middle levels of administration. Regional, provincial government. Regional authorities
- Middle period
- Middle period
- Military administration
- Military affairs generally
- Military affairs. Art of war. Military science. Defence. Armed forces
- Military and naval aviation. Air defence
- Military aviation. Flying corps. Air force
- Military engineering
- Military establishments: organization, functions
- Military justice and jurisdiction. Courts martial. Military tribunals
- Military penal law. Laws of armed land forces
- Mine drainage. Unwatering (dewatering)
- Mineral and metal fibres. Braiding materials. Rubber threads. Paper yarns
- Mineral oil technology. Technology of petroleum and allied products
- Mineral springs
- Mineralogical sciences. Crystallography. Mineralogy
- Mineralogy. Special study of minerals
- Mining
- Mining hazards, accidents and damage. Health protection and safety in mines
- Mining of specific minerals, ores, rocks
- Mining operations. Exploration, opening-up, development, working of mineral deposits
- Ministries for general business
- Minor aiming games. Children's miniature games
- Minor board games not dependent on chance
- Miscellanea. Polygraphies. Selections
- Miscellaneous organic chemical industries
- Mixe-Zoque languages
- Modern art movements (from late 19th century). Realism, impressionism and subsequent 20th century trends
- Modern Christian movements and churches
- Modern Indic languages
- Modern Indic languages
- Modern movements arising from Judaism
- Modern period
- Modern period
- Modern spiritual movements
- Moldova. Republic of Moldova. Republica Moldoveneasca
- Mollusca. Bryozoa. Brachiopoda
- Mollusca. Bryozoa. Brachiopoda
- Mon-Khmer languages
- Money. Monetary system. Banking. Stock exchanges
- Mongolia. State of Mongolia. Mongol Uls
- Mongolian languages
- Montenegro. Crna Gora
- Moral behaviour. Moral theology
- Moral philosophy. Ethics. Practical philosophy
- Morocco. Kingdom of Morocco. al-Maġrib. al-Mamlakâtu l-Maġribīyâ
- Mosaics
- Motor functions. Organs of locomotion. Voice. Integument
- Motoring. Motorcycling
- Mountaineering, climbing equipment. Swimming equipment
- Movable bridges
- Movables in general. Personalty
- Moving house. Removals
- Mozambique. Republic of Mozambique. República de Moçambique
- Multilingual. Polyglot
- Munda languages
- Museums. Permanent exhibitions
- Music
- Music teaching aids. Other music accessories
- Musical instruments and accessories
- Musical productions
- Musical sounds and perception
- Myanmar (Burma). Republic of the Union of Myanmar. Pyidaunzu Thanmăda Myăma Nainngandaw