A book from Wikibooks.

The library contains 18,130 pages divided into 545 books, 85 of which are downloadable in PDF.

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There are currently two internal indexing systems for finding content:

All books by category

All books according to the universal decimal classification

Nuvola apps bookcase pastel.png Thematic search of books

according to Classification Universal Decimal (CDU)


The thematic search for books is based on the Universal Decimal Classification.

This classification is based on a few basic principles:

  • everything classify: there is no “miscellaneous” section,
  • classify from content documents to be processed: it is therefore an ideological classification, in the true sense of the term,
  • classify by going from general to specific.

The whole of human knowledge, considered as the unit, is subdivided into tenths, then into hundredths, and so on. The indices of the CDU are therefore decimal numbers deprived of the zero and the comma. Thereby, 126 is ranked before 59, since 0.126 is a smaller number than 0.59. The numerical classification is arbitrary but it can be used in all the countries of the world, which is not the case, for example, for the alphabetical classification.

The use of indices has innumerable possibilities, to the point of constituting a veritable documentary language which expresses, in a codified form, very complex notions. We will not report it here.


By following the links given in the tables, the reader will normally end up with a short list containing all the books relating to the subject that interests him. Any page with too many references can be easily subdivided like the previous ones. The same book dealing with various subjects can of course be referenced in several places.

the 0 (zero) ending a clue always signals that they are generalities about the above: the clue 30for example, brings together general notions of the social sciences.

Attention ! Due to various updates dictated by the evolution of knowledge and techniques, the numbering presents some irregularities which are not necessarily errors!

On the endpapers of classified books, you can affix the template {{CDU}}.

If in doubt, see Jean-Jacques MILAN

Main Divisions

0 – General
foundations of knowledge and culture, bibliographies, librarianship, encyclopaedias, reference works, dictionaries, periodicals, communities, societies, academies, research institutes, museums, newspapers, journalism, polygraphs, manuscripts, bibliophilia.
1 – Philosophy, psychology
metaphysics, philosophy, occult sciences, psychology, logic, epistemology, theory of knowledge, morals, ethics.
2 – Religion, theology
philosophy of religions, reference works, dogmatic theology, moral theology, pastoral theology, churches, history of religions and cults.
3 – Social sciences
general theories and methods of the social sciences, statistics, demography, sociology, politics, economics, law, jurisprudence, legislation, public administration, governments, military affairs, consumer and consumer issues, education, teaching, administration of weights and measures , ethnology, customs, folklore.
4 – division currently unoccupied
5 – Exact and natural sciences
generalities on the sciences and the protection of nature, mathematics, astronomy, geodesy, physics, theoretical chemistry, mineralogy, crystallography, physical geology, oceanography, meteorology, climatology, hydrology, paleontology, biology, general ecology, genetics, botany, zoology.
6 – Applied sciences, technology
medicine and pharmacy, art of engineering, agriculture, animal husbandry, home economics, cooking, chemical and related industries, miscellaneous industries and trades, computer science, building and construction industries, building materials
7 – Arts, entertainment, sports
regional planning, town planning, architecture, visual arts, music, games, sports, performing arts
8 – Linguistics, philology, literature
languages, literary forms and genres, particular literatures,
9 – Archaeology, geography, biography, history
classification of studies according to territories, periods, types of documents, etc.

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