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- L: 103 terms
- Laboratory apparatus and instrumentation in general. Laboratory methods in general
- Labour market. Employment
- Labour. Employment. Work. Labour economics. Organization of labour
- Lamaism
- Land economics
- Land minefields. Field obstacles. Flooding
- Land requirement. Long-term planning of land use
- Land transport
- Land transport by conveyor systems and pipelines
- Land use
- Land value. Value of plots, sites, holdings. Real-estate value. Productivity. Rents
- Land vehicle engineering (excluding rail vehicles)
- Land-based military engineering. Artillery
- Language planning. Control of language. Standardization of language
- LANGUAGE. LINGUISTICS. LITERATURE
- Languages
- Languages (natural and artificial)
- Laos. Lao People's Democratic Republic. Meuang Lao. Sathalanalat Paxathipatai Paxaxon Lao
- Large ruminants. Cattle, oxen
- Latin
- Latin language
- Latin literature
- Latvia. Republic of Latvia. Latvijas Republika
- Latvian (Lettish)
- Latvian / Lettish language
- Latvian literature
- Law in general. Legal methods and auxiliary sciences
- Law of international organizations
- Law of realty. Real rights. Things. Chattels
- Law of war. International legal relations in war
- Law. Jurisprudence
- Laws of air, space, ether
- Learned, scientific societies. Academies
- Leather industry (including fur and imitation leather)
- Lebanon. Republic of Lebanon. Lubnān. Liban. al-Jumhūrīyah al-Lubnānīyah. République libanaise
- Legal administration. Religious law. Canon law
- Legal procedure. Judiciary personnel and organization
- Legal sources. Legal documents
- Leisure
- Lesotho. Kingdom of Lesotho. Muso oa Lesotho
- Letters. Art of letter-writing. Correspondence. Genuine letters. Other works in epistolary form
- Levant. Asia Minor
- Levels of administration. Local, regional, central administration
- Liberia. Republic of Liberia
- Librarianship
- Libraries for special classes of user
- Libraries of institutions of higher education
- Libraries of institutions of primary and secondary education
- Library administration. Staff. Personnel
- Library site, building, premises. Equipment
- Libya. Libyan Arab Jamahiriya. Al-Jamāhīrīyyah al-‘Arabīyyah al-Lībīyyah ash-Sha’bīyyah al-Īshtīrākīyyah
- Lichens
- Liechtenstein. Principality of Liechtenstein. Fürstentum Liechtenstein
- Lifting gear and inclined planes for vessels
- Lighting. Illumination engineering
- Linear and geometric drawing. Technical drawing
- Linen wear. Lingerie
- Linguistic-cultural groups, ethnic groups, peoples
- Linguistics and languages
- Liquid motion. Hydrodynamics
- Literary criticism. Literary studies
- Literary schools, trends and movements
- Literature
- Literature in artificial languages
- Literature of Afro-Asiatic, Nilo-Saharan, Congo-Kordofanian, Khoisan languages
- Literature of American indigenous languages (Amerindian literatures)
- Literature of Austro-Asiatic languages. Austronesian literature
- Literature of Balkan Romance / Romanic languages
- Literature of Baltic languages
- Literature of Caucasian languages. Literature of dead languages of unknown affiliation
- Literature of Finnic languages
- Literature of Finno-Ugric languages
- Literature of Gallo-Romance / Gallo-Romanic languages
- Literature of Germanic languages
- Literature of Ibero-Romance / Ibero-Romanic) languages
- Literature of Indo-Iranian languages
- Literature of Indo-Pacific (non-Austronesian) languages. Australian (Aboriginal) literature
- Literature of Italic languages
- Literature of Italo-Romance / Italo-Romanic languages
- Literature of modern Indic languages
- Literature of Romance (Romanic) languages
- Literature of Sino-Tibetan languages
- Literature of Slavic (Slavonic) languages
- Literature of Ugric languages
- Literature of Ural-Altaic languages
- Literature of Ural-Altaic, Japanese, Korean, Ainu, Palaeo-Siberian, Eskimo-Aleut, Dravidian languages, Sino-Tibetan languages
- Literature of Uralic languages
- Literatures of individual languages and language families
- Lithuania. Republic of Lithuania. Lietuvos Respublika
- Lithuanian
- Lithuanian language
- Lithuanian literature
- Local circulatory disorders
- Location. Source. Transit. Destination
- Locks
- Logic. Epistemology. Theory of knowledge. Methodology of logic
- Logical methodology
- Logistic. Symbolic logic. Mathematical logic. Logical calculus
- Long waves. Infrared
- Low ball games with striking implement
- Lowest administrative units. Localities
- Lowest levels of administration. Local government. Municipal administration. Local authorities
- Luxembourg. Grand Duchy of Luxembourg. Grand-Duché de Luxembourg. Grossherzogtum Luxemburg. Grousherzogdem Lëtzebuerg