Polythematic Structured Subject Heading System

  1. oak USE deciduous trees
  2. oats
  3. obesity
  4. object
  5. object activity
  6. object oriented databases
  7. object programmes USE object programming
  8. object programming
  9. object thinking
  10. object-oriented programming
  11. objective cognition
  12. objective conceptions
  13. objective evaluation USE philosophy of values
  14. objective function
  15. objective psychology
  16. objectives
  17. obligation to support USE maintenance obligation
  18. obligations
  19. obligations of nationals USE foreign exchange control
  20. obligatory bank reserves USE bank reserves
  21. obligatory education USE education
  22. oblique impact USE impact of bodies
  23. obscurations
  24. obscure binary stars USE double stars
  25. observability of systems
  26. observance of law USE legal conscience
  27. observation
  28. observation wells USE wells (water)
  29. observational conditions
  30. observatories
  31. obsession
  32. obsessive behaviour USE obsession
  33. obstetrical and gynaecological surgery
  34. obstetrics
  35. occasional assets USE assets
  36. occasional graphics USE applied graphic arts
  37. occult psychology USE parapsychology
  38. occupation
  39. occupational administration
  40. occupational diseases
  41. occupational health
  42. occupational lung diseases
  43. occupational medicine
  44. occupational personal protective devices
  45. occupational safety and health
  46. occupational therapy
  47. ocean basin
  48. ocean bottom expansion
  49. ocean crust
  50. ocean surface shape
  51. ocean thermal zones
  52. oceanic climate
  53. oceanic currents
  54. Oceanic languages USE Austronesian languages
  55. oceanographic maps
  56. oceanography
  57. oceanology USE oceanography
  58. oceans
  59. OCR USE optical character processing
  60. octane
  61. oculars
  62. odes USE lyric poetry
  63. odontometry
  64. oestrus USE reproduction of animals
  65. oestrus synchronization USE reproduction of animals
  66. off-balance sheet account USE accounts
  67. offence against property USE crime against property
  68. offence against public order
  69. offer
  70. office buildings
  71. office equipments USE office machines
  72. office furniture
  73. office machines
  74. office rooms
  75. office supplies
  76. official accounts
  77. official books
  78. official Marxism
  79. official sources
  80. offset USE planographic printing
  81. offshore transport
  82. ohmic resistance USE resistors
  83. ohmmeters
  84. Ohm´s law
  85. oil
  86. oil colours USE artist colours
  87. oil crops
  88. oil dome
  89. oil paintings USE painting
  90. oil paints
  91. oil pipes
  92. oil producing factories
  93. oil transformers USE transformers
  94. oil waste water USE industrial waste water
  95. oilbearing sediments
  96. oilbearing structure
  97. oils
  98. oilseed crops USE oil crops
  99. old age sociology USE gerontosociology
  100. Old Catholic Church
  101. Old Church Slavonic language USE Slavonic languages
  102. old editions
  103. old glass USE glass
  104. old literature
  105. old star types USE stars
  106. old stars USE stars
  107. Old Testament
  108. Old Testament apocryphs USE non-canonical books
  109. Old-Slavonic language USE Slavonic languages
  110. olefins USE alkenes
  111. olfactory organs USE sense organs
  112. oligarchy
  113. oligomers
  114. oligophreny
  115. oligopoly
  116. oligosaccharides
  117. olympic games
  118. olympic movement
  119. ombrometer USE raingauges
  120. ombudsman USE public defender of rights
  121. on-board service
  122. oncology
  123. ondometers USE wavemeters
  124. one party system
  125. one real variable functions
  126. one-room flats USE apartments
  127. one-track motor vehicles
  128. one-track vehicles
  129. onions USE bulbous vegetables
  130. onium compounds USE hypotonics
  131. online catalogues
  132. online information systems
  133. Onsager´s relations
  134. ontogenesis of mentality USE child psychology
  135. ontogeny
  136. ontological dualism
  137. ontological pluralism USE ontology
  138. ontology
  139. oolitic structure
  140. Oort's cloud USE interplanetary matter
  141. Op Art
  142. OPAC USE online catalogues
  143. open access
  144. open air grounds
  145. open clusters USE clusters of stars
  146. open die forging
  147. open dies
  148. open grounds USE open air grounds
  149. open lakes USE river lakes
  150. open loop control USE control theory
  151. open mapping
  152. open mapping theorems
  153. open oscillator USE oscillators
  154. open rolling mills USE rolling trains
  155. open society
  156. open source USE open source software
  157. open source software
  158. open systems
  159. open universities USE universities
  160. open-cast mining USE surface mining
  161. open-hearth furnaces
  162. open-hearth steel
  163. opencast quarry mining
  164. openings
  165. opera
  166. operating points
  167. operating points adjustment
  168. operating system process management
  169. operating systems
  170. operation
  171. operation insurance USE insurance
  172. operation of a statute USE legal rules
  173. operational amplifiers
  174. operational calculation
  175. operational codes
  176. operational records
  177. operational research USE operations research
  178. operational surgery
  179. operationism
  180. operations
  181. operations research
  182. operative techniques
  183. operator calculus
  184. operator equations
  185. operator theory
  186. operetta
  187. ophitic structure
  188. ophtalmology
  189. opinion
  190. opinion polls
  191. opium alkaloids USE analgesics
  192. opportunistic infections
  193. optic anisotropy USE birefringence of light
  194. optic bistability
  195. optic cables
  196. optic fibres
  197. optic glass
  198. optic holography USE holography
  199. optic illusions USE sensory illusions
  200. optic instruments