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000 Generalities
100 Philosophy
200 Religion
300 Social Sciences
400 Languages
500 Pure Sciences
600 Applied Sciences & Technology
700 Arts
800 Literature
900 History & Geography

Main headings

000 Generalities
010 Bibliographies
020 Library & Information Science
030 General Encyclopedias
040 (Not used)
050 General Periodicals
060 General Organizations & Museums
070 Journalism & Publishing
080 Collections
090 Manuscripts and Rare Books

100 Philosophy
110 Metaphysics
120 Epistemology
130 Paranormal Phenomena & Occult
140 Specific Philosophies
150 Psychology
160 Logic
170 Ethics
180 Ancient, Medieval & Oriental Philosophy
190 Modern Western Philosophy

200 Religion
210 Natural Religion
220 Bible
230 Christian Theology
240 Christian Moral Theology
250 Local Church & Religious Orders
260 Social & Ecclesiastical Theology
270 History & Geography of Church
280 Christian Denominations & Sects
290 Non-Christian & Comparative Religion

300 Social Sciences
310 Statistics
320 Political Science
330 Economics
340 Law
350 Public Administration
360 Social Concerns & Services
370 Education
380 Trade & Commerce
390 Customs, Etiquette, Folklore

400 Languages
410 Linguistics
420 English Language
430 Germanic & Scandinavian Languages
440 French
450 Italian
460 Spanish & Portuguese
470 Latin
480 Classical Greek
490 Other Languages

500 Pure Sciences
510 Math
520 Astronomy
530 Physics
540 Chemistry
550 Earth Science
560 Paleontology
570 Life Sciences
580 Botany
590 Zoology

600 Applied Sciences & Technology
610 Medicine
620 Engineering
630 Agriculture
640 Home Economics
650 Management
660 Chemical Technologies
670 Manufacturing
680 Application-specific Manufacturing
690 Building

700 Arts
710 Civic & Landscape Art
720 Architecture
730 Sculpture
740 Drawing
750 Painting
760 Graphic & Printed Art
770 Photography
780 Music
790 Sports and Recreation

800 Literature
810 American Literature
820 English Literature
830 Germanic Literature
840 French Literature
850 Italian Literature
860 Spanish & Portuguese Literature
870 Latin Literature
880 Classical Greek Literature
890 Literature of Other Languages

900 History & Geography
910 Travel & Geography
920 Genealogy & Geography
930 Ancient History
940 European History
950 Asian History
960 African History
970 North American History
980 South American History
990 History of Other Areas