The book by Melvil Dewey which serves as the basis for the Dewey Decimal System. It's available in an abridged format for your personal library or for small libraries, but medium and large libraries usually use the full Dewey.

The Dewey Decimal Classification and Relative Index is divided, as the name suggests, into two parts. The first part, the Dewey Decimal Classification, is ordered by the numbers (for example, E2 might be under 032, "General encyclopedic works in English"). The second part, the Relative Index, is in alphabetical order so that you can look up anthropology and see that it's somewhere around 573.

If this fascinates you, perhaps you have a not-very-lucrative career ahead of you in the field of librarianship.

Do you crave order? Think Everything has become disruly? Like to see some over-arching system put in place so that you could navigate with more ease, feeling that sense of well-being which comes only through a well-articulated metadata structure? Maybe you'd like to take a shot at E2 node Classification then? No, really, go for it! Godspeed! All the power to you, say I...Dewey will love you for it I'm sure...(though LC might be more your thing!).
000 -- Generalities

010 -- Bibliography
020 -- Information Science & Librarianship
030 -- Encyclopaedias
040 -- Currently unassigned
050 -- General serials
060 -- Organisations
070 -- Journalism, Publishing
080 -- General collections
090 -- Manuscripts, Rare books

100 -- Philosophy, Psychology
110 -- Metaphysics
120 -- Epistemology
130 -- Parapsychology, Occultism
140 -- Specific philosophical schools
150 -- Psychology
160 -- Logic
170 -- Ethics
180 -- Ancient, Medieval, Eastern Philosophy
190 -- Modern Western philosophy

200 -- Religion
210 -- Natural theology
220 -- Bible
230 -- Christian theology
240 -- Moral & devotional theology
250 -- Christian religious orders
260 -- Christian social theology
270 -- Church history
280 -- Church denominations & sects
290 -- Other & comparative religions

300 -- Social sciences
310 -- General statistics
320 -- Political science
330 -- Economics
340 -- Law
350 -- Public administration
360 -- Social services
370 -- Education
380 -- Commerce, communications
390 -- Customs, Folklore

400 -- Languages
410 -- Linguistics
420 -- English, & Old English
430 -- Germanic languages
440 -- French
450 -- Italian
460 -- Spanish
470 -- Latin
480 -- Classical Greek
490 -- Other languages (including Irish)

500 -- Natural sciences
510 -- Mathematics
520 -- Astronomy
530 -- Physics
540 -- Chemistry
550 -- Earth sciences
560 -- Palaeontology
570 -- Life sciences
580 -- Botany
590 -- Zoology

600 -- Technology (Applied sciences)
610 -- Medical sciences
620 -- Engineering
630 -- Agriculture
640 -- Home economics & family living
650 -- Management
660 -- Chemical engineering
670 -- Manufacturing
680 -- Manufacturing for specific purposes
690 -- Buildings & Construction

700 -- The Arts

710 -- Civic & landscape art
720 -- Architecture
730 -- Sculpture
740 -- Drawing
750 -- Painting
760 -- Graphic arts
770 -- Photography
790 -- Performing arts & Sport

800 -- Literature

810 -- American literature in English
820 -- English & Old English literature
830 -- Germanic literature
840 -- French literature
850 -- Italian literature
860 -- Spanish & Portuguese literatures
870 -- Latin literature
880 -- Classical Greek literature
890 -- Literatures of other languages

900 -- Geography & History
910 -- Geography & travel
920 -- Genealogy
930 -- Ancient history
940 -- History of Europe
950 -- History of Asia
960 -- History of Africa
970 -- History of North America
980 -- History of South America
990 -- History of other areas

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