Universal Decimal Classification

  1. Laboratory apparatus and instrumentation in general. Laboratory methods in general
  2. Labour market. Employment
  3. Labour. Employment. Work. Labour economics. Organization of labour
  4. Lamaism
  5. Land economics
  6. Land minefields. Field obstacles. Flooding
  7. Land requirement. Long-term planning of land use
  8. Land transport
  9. Land transport by conveyor systems and pipelines
  10. Land use
  11. Land value. Value of plots, sites, holdings. Real-estate value. Productivity. Rents
  12. Land vehicle engineering (excluding rail vehicles)
  13. Land-based military engineering. Artillery
  14. Language planning. Control of language. Standardization of language
  16. Languages
  17. Languages (natural and artificial)
  18. Laos. Lao People's Democratic Republic. Meuang Lao. Sathalanalat Paxathipatai Paxaxon Lao
  19. Large ruminants. Cattle, oxen
  20. Latin
  21. Latin language
  22. Latin literature
  23. Latvia. Republic of Latvia. Latvijas Republika
  24. Latvian (Lettish)
  25. Latvian / Lettish language
  26. Latvian literature
  27. Law in general. Legal methods and auxiliary sciences
  28. Law of international organizations
  29. Law of realty. Real rights. Things. Chattels
  30. Law of war. International legal relations in war
  31. Law. Jurisprudence
  32. Laws of air, space, ether
  33. Learned, scientific societies. Academies
  34. Leather industry (including fur and imitation leather)
  35. Lebanon. Republic of Lebanon. Lubnān. Liban. al-Jumhūrīyah al-Lubnānīyah. République libanaise
  36. Legal administration. Religious law. Canon law
  37. Legal procedure. Judiciary personnel and organization
  38. Legal sources. Legal documents
  39. Leisure
  40. Lesotho. Kingdom of Lesotho. Muso oa Lesotho
  41. Letters. Art of letter-writing. Correspondence. Genuine letters. Other works in epistolary form
  42. Levant. Asia Minor
  43. Levels of administration. Local, regional, central administration
  44. Liberia. Republic of Liberia
  45. Librarianship
  46. Libraries for special classes of user
  47. Libraries of institutions of higher education
  48. Libraries of institutions of primary and secondary education
  49. Library administration. Staff. Personnel
  50. Library site, building, premises. Equipment
  51. Libya. Libyan Arab Jamahiriya. Al-Jamāhīrīyyah al-‘Arabīyyah al-Lībīyyah ash-Sha’bīyyah al-Īshtīrākīyyah
  52. Lichens
  53. Liechtenstein. Principality of Liechtenstein. Fürstentum Liechtenstein
  54. Lifting gear and inclined planes for vessels
  55. Lighting. Illumination engineering
  56. Linear and geometric drawing. Technical drawing
  57. Linen wear. Lingerie
  58. Linguistic-cultural groups, ethnic groups, peoples
  59. Linguistics and languages
  60. Liquid motion. Hydrodynamics
  61. Literary criticism. Literary studies
  62. Literary schools, trends and movements
  63. Literature
  64. Literature in artificial languages
  65. Literature of Afro-Asiatic, Nilo-Saharan, Congo-Kordofanian, Khoisan languages
  66. Literature of American indigenous languages (Amerindian literatures)
  67. Literature of Austro-Asiatic languages. Austronesian literature
  68. Literature of Balkan Romance / Romanic languages
  69. Literature of Baltic languages
  70. Literature of Caucasian languages. Literature of dead languages of unknown affiliation
  71. Literature of Finnic languages
  72. Literature of Finno-Ugric languages
  73. Literature of Gallo-Romance / Gallo-Romanic languages
  74. Literature of Germanic languages
  75. Literature of Ibero-Romance / Ibero-Romanic) languages
  76. Literature of Indo-Iranian languages
  77. Literature of Indo-Pacific (non-Austronesian) languages. Australian (Aboriginal) literature
  78. Literature of Italic languages
  79. Literature of Italo-Romance / Italo-Romanic languages
  80. Literature of modern Indic languages
  81. Literature of Romance (Romanic) languages
  82. Literature of Sino-Tibetan languages
  83. Literature of Slavic (Slavonic) languages
  84. Literature of Ugric languages
  85. Literature of Ural-Altaic languages
  86. Literature of Ural-Altaic, Japanese, Korean, Ainu, Palaeo-Siberian, Eskimo-Aleut, Dravidian languages, Sino-Tibetan languages
  87. Literature of Uralic languages
  88. Literatures of individual languages and language families
  89. Lithuania. Republic of Lithuania. Lietuvos Respublika
  90. Lithuanian
  91. Lithuanian language
  92. Lithuanian literature
  93. Local circulatory disorders
  94. Location. Source. Transit. Destination
  95. Locks
  96. Logic. Epistemology. Theory of knowledge. Methodology of logic
  97. Logical methodology
  98. Logistic. Symbolic logic. Mathematical logic. Logical calculus
  99. Long waves. Infrared
  100. Low ball games with striking implement
  101. Lowest administrative units. Localities
  102. Lowest levels of administration. Local government. Municipal administration. Local authorities
  103. Luxembourg. Grand Duchy of Luxembourg. Grand-Duché de Luxembourg. Grossherzogtum Luxemburg. Grousherzogdem Lëtzebuerg