Universal Decimal Classification

  1. Painting
  2. Pakistan. Islamic Republic of Pakistan. Islāmī Jumhūrī-ye Pākistān
  3. Palaeo-Siberian languages
  4. Palaeogeography
  5. Palaeontology
  6. Pali
  7. Pama-Maric group
  8. Pama-Nyungan group
  9. Pamphlets. Brochures
  10. Panama. Republic of Panama. República de Panamá
  11. Papua New Guinea. Independent State of Papua New Guinea
  12. Paraguay. Republic of Paraguay. República del Paraguay. Tetã Paraguái
  13. Parliaments. Representation of the people. Governments
  14. Parlour games. Party games
  15. Partially polarized light
  16. Participation (number of players), combinations etc.
  17. Particular activities of public administration
  18. Particular kinds of compound
  19. Particular offences. Specific punishable acts
  20. Particular social recreations, requiring preparations
  21. Parts of the environment
  22. Parts, spaces and rooms planned for specific uses
  23. Pashto (Pushto)
  24. Patagonian and Fuegian languages
  25. Pathological anatomy. Morbid anatomy
  26. Pathological physiology. Processes, mode of action of diseases. Pathogenesis. Study of origin of diseases
  27. Pathology of the circulatory system, blood vessels. Cardiovascular complaints
  28. Pathology of the digestive system. Complaints of the alimentary canal
  29. Pathology of the lymphatic system, haemopoietic (haematopoietic) organs, endocrines
  30. Pathology of the organs of locomotion. Skeletal and locomotor systems
  31. Pathology of the respiratory system. Complaints of the respiratory organs
  32. Pathology of the urogenital system. Urinary and sexual (genital) complaints. Urology
  33. Pathology. Clinical medicine
  34. Pattern games or puzzles requiring patience or dexterity
  35. Pattern information processing
  36. Pattern of property variations
  37. People as providers of social welfare assistance
  38. Peoples associated with particular places
  39. Performance, presentation (in original medium)
  40. Periodical literature. Writings in serials, journals, reviews. Journalism. Occasional literature. Polemic, political writings. Pamphleteering
  41. Periodicals (in the strict sense)
  42. Periodicity. Frequency. Recurrence at specified intervals.
  43. Periods and phases in the history of music. Musical schools, styles and influences
  44. Periods and phases of architecture. Schools, styles, influences
  45. Peripherals. Input-output units
  46. Perissodactyla (Odd-toed ungulates)
  47. Persian
  48. Personal documents. Correspondence. Letters. Circulars
  49. Personal hygiene. Clothing
  50. Personal requisites. Household management
  51. Personnel management. Human Resources management
  52. Persons according to age or age-groups
  53. Persons according to constitution, health, disposition, hereditary or other traits
  54. Persons according to domicile and its relation to work or other activity
  55. Persons according to economic categories (means, security, other rights)
  56. Persons according to education, training, experience
  57. Persons according to ethnic characteristics, nationality, citizenship etc.
  58. Persons according to executive functions
  59. Persons according to gender and kinship
  60. Persons according to general constitution, disposition or character
  61. Persons according to income sources or insurance
  62. Persons according to intelligence and mental or psychological state
  63. Persons according to marriage, family or other civil status
  64. Persons according to occupation, work, livelihood, education
  65. Persons according to physical state and health
  66. Persons according to sexual orientation
  67. Persons according to social class or status
  68. Persons according to social class, civil status
  69. Persons according to temperament, predisposition
  70. Persons according to work, employment, administrative status
  71. Persons and personal characteristics in pathology. Characteristics of the patient
  72. Persons and things in international law
  73. Persons as agents, doers, practitioners (studying, making, serving etc.)
  74. Persons as targets, clients, users (studied, served etc.)
  75. Persons belonging to marginal socioeconomic categories. Fringe groups
  76. Persons in collateral relation
  77. Persons in filial or descendant relation
  78. Persons in parental or ascendant relation. Ancestors. Forebears
  79. Persons in relation to workplace, site of employment. Persons in relation to the enterprise
  80. Persons in religion
  81. Perspective in drawing
  82. Peru. Republic of Peru. República del Perú
  83. Petrology. Petrography
  84. Pharmaceutical preparations. Medical material. Equipment
  85. Pharmacology. Therapeutics. Toxicology
  86. Phase relations
  87. Phenomena in time. Phenomenology of time
  88. Philippines. Republic of the Philippines. Republika ng Pilipinas
  89. Philosophical systems and points of view
  90. Philosophy of culture. Cultural systems. Theory of cultural complexes
  91. Philosophy of mind and spirit. Metaphysics of spiritual life
  93. Pholidota. Xenarthra
  94. Phonetics. Phonology
  95. Photogrammetry: aerial, terrestrial
  96. Photographic equipment, apparatus and materials
  97. Photographic operations
  98. Photographic systems, processes (especially those using inorganic substances or physical phenomena)
  99. Photographs according to intermediate stages
  100. Photographs according to support or base material
  101. Photographs, pictures or prints according to appearance, form or size
  102. Photography and exposures according to ambient conditions
  103. Photography and similar processes
  104. Photolithography. Photographic production of planographic plates
  105. Photomechanical processes generally
  106. Physical and physicochemical operations and equipment. Physical and physicochemical effects on chemical processes
  107. Physical anthropology
  108. Physical chemistry
  109. Physical chemistry of solids, liquids and gases
  110. Physical geography
  111. Physical nature of matter
  112. Physical oceanography. Submarine topography. Ocean floor
  113. Physical planning. Regional, town and country planning. Landscapes, parks, gardens
  114. Physical properties and phenomena. Constants. Effects acting on state and properties of matter
  115. Physical, physicochemical and electrical operations
  116. Physicochemical methods of analysis (other than optical methods)
  117. Physics
  118. Physiographic designation
  119. Physiography
  120. Physiological acoustics. Medical acoustics
  121. Physiology. Human and comparative physiology
  122. Physiotherapy. Physical therapy. Radiotherapy. Other nonmedicinal therapeutic treatment
  123. Pictorial material
  124. Pictorial, artistic photography. Photographs according to subject
  125. Picture writing
  126. Pigs. Swine
  127. Pisces (Fishes) (scientifically outdated class)
  128. Place and space in general. Localization. Orientation
  129. Places and areas according to privacy, publicness and other special features
  130. Places of the ancient and mediaeval world
  131. Planets and their satellites. Planetology
  132. Planning of landscape (natural and designed). Parks. Gardens
  133. Planographic techniques. Lithography (autolithography)
  134. Plant damage, injuries. Plant diseases. Pests, organisms injurious to plants. Plant protection
  135. Plant diseases. Plant pathology. Phytopathology
  136. Plant histology
  137. Plant management. Physical resources management
  138. Plant morphology. Plant anatomy
  139. Plant physiology
  140. Plantae
  141. Plants with edible stalks, leaves or flowers
  142. Plants yielding stimulants. Beverage plants
  143. Plasma physics
  144. Plastic arts
  145. Plastics
  146. Platyrrhini
  147. Pneumatic energy, machinery and tools. Refrigeration
  148. Poetry. Poems. Verse
  149. Poisoning. Intoxication
  150. Poland. Polish Republic. Rzeczpospolita Polska
  151. Polarization. Double refraction. Dispersion in anisotropic bodies
  152. Polarized light
  153. Polish
  154. Polish language
  155. Polish literature
  156. Political influence, pressure, on other states
  157. Political parties and movements
  158. Politics
  159. Polygraphies. Collective works
  160. Polynesia. States and regions of Polynesia
  161. Popular, traditional, historic vocal music
  162. Population
  163. Population. Depopulation
  164. Porcelain
  165. Porcelain. China
  166. Ports, harbours and roadsteads: engineering and construction works in general
  167. Portugal. Portuguese Republic. República Portuguesa
  168. Portuguese
  169. Portuguese language
  170. Portuguese literature
  171. Positive law. Legal norm. Enacted law. Statute law. Ius scriptum. Operation of legal norm. Rules of its application
  172. Possible philosophical attitudes. System typology
  173. Post-Renaissance
  174. Postal services and administration
  175. Potable alcohol. Spirituous liquors (ardent spirits). Alcohol distillation, refining
  176. Poultry
  177. Power of the state. System and function of organs of government
  178. Practical knowledge of languages
  179. Practical laboratory chemistry. Preparative and experimental chemistry
  180. Prakrit
  181. Preaching (as education and instruction)
  182. Precambrian to Mesozoic (from more than 600 to 70 MYBP)
  183. Precision mechanisms and instruments
  184. Prehistoric and primitive religions
  185. Prehistoric art. Primitive art (ancient and modern)
  186. Prehistoric religions
  187. Prehistory. Prehistoric remains, artefacts, antiquities
  188. Preliminary investigation. Mine surveying and mapping. Exploration of mineral deposits (surface and underground)
  189. Presentation in chronological, historical form. Historical presentation in the strict sense
  190. Presentation in historical form. Legal and historical sources
  191. Presentations of art of movement. Choreography
  192. Preservation of rural and urban amenities generally
  193. Pressure. Pressure range
  194. Prevention and control of communicable (infectious, contagious) diseases. Prevention of epidemics
  195. Prices. Price formation. Costs
  196. Primary divisions of a country. Regions (generally). States in a federation
  197. Primates
  198. Primitive religions
  199. Principal stages of cinema development
  200. Principles and practice of physical planning. Regional, town and country planning