Dewey Decimal Classification (DDC)

  1. Accounting
  2. Administration of economy & environment
  3. Administration of physical plant
  4. Adult education
  5. Advertising & public relations
  6. African languages
  7. African literatures
  8. Afro-Asiatic languages; Semitic languages
  9. Afro-Asiatic literatures; Semitic literatures
  10. Agriculture
  11. Agriculture & related technologies
  12. Air & other specialized forces
  13. Algebra
  14. Algeria
  15. Altaic, Uralic, Hyperborean & Dravidian
  16. Altaic, Uralic, Hyperborean & Dravidian
  17. American drama in English
  18. American essays in English
  19. American fiction in English
  20. American humor & satire in English
  21. American letters in English
  22. American literature in English
  23. American literature in English
  24. American miscellaneous writings
  25. American poetry in English
  26. American speeches in English
  27. Analogy
  28. Analysis
  29. Analytical chemistry
  30. Ancient, medieval & eastern philosophy
  31. Ancient, medieval & eastern philosophy
  32. Anglican churches
  33. Animal husbandry
  34. Animals (Zoology)
  35. Animals (Zoology)
  36. Apocrypha & pseudepigrapha
  37. Apologetics & polemics
  38. Applied physics
  39. Applied psychology
  40. Aquatic & air sports
  41. Arabian Peninsula & adjacent areas
  42. Architectural structure
  43. Architecture
  44. Architecture
  45. Architecture from 1400
  46. Architecture from ca. 300 to 1399
  47. Architecture to ca. 300
  48. Arctic islands & Antarctica
  49. Area planning
  50. Argentina
  51. Argument & persuasion
  52. Aristotelian philosophy
  53. Arithmetic
  54. Art metalwork
  55. Arthropods
  56. Arts
  57. Arts & recreation
  58. Associations
  59. Associations for religious work
  60. Associations, organizations & museums
  61. Astronomy
  62. Astronomy & allied sciences
  63. Athletic & outdoor sports & games
  64. Atlantic Ocean islands
  65. Atlases, maps, charts & plans
  66. Australia
  67. Austronesian & other languages
  68. Austronesian & other literatures
  69. Auxiliary construction practices