Classification
333 - Economics of land & energy
600 - Technology
620 - Engineering & allied operations
873
700 - The arts; fine & decorative arts
682
900 - History & geography
673
330 - Economics
452
363 - Other social problems & services
397
000 - Computer science, information & general works
376
380 - Commerce, communications & transportation
273
610 - Medicine & health
215
320 - Political science
195
580 - Plants (Botany)
184
140 - Specific philosophical schools
128
576 - Genetics & evolution
121
551 - Geology, hydrology & meteorology
109
370 - Education
104
630 - Agriculture & related technologies
104
500 - Natural sciences & mathematics
90
720 - Architecture
63
581 - Specific topics in natural history
56
540 - Chemistry & allied sciences
54
340 - Law
52
800 - Literature & rhetoric
50
414 - Phonology & phonetics
47
530 - Physics
46
658 - General management
46
304 - Factors affecting social behavior
43
300 - Social sciences
28
100 - Philosophy & psychology
20
170 - Ethics
19
400 - Language
18
657 - Accounting
14
612 - Human physiology
9
200 - Religion
8
410 - Linguistics
8
336 - Public finance
6
361 - Social problems & social welfare in general
6
770 - Photography, photographs & computer art
6
780 - Music
6
350 - Public administration & military science
5
297 - Islam, Babism & Bahai Faith
4
550 - Earth sciences
4
650 - Management & auxiliary services
4
120 - Epistemology, causation & humankind
3
301 - Sociology & anthropology
3
520 - Astronomy & allied sciences
3
791 - Public performances
3
160 - Logic
2
615 - Pharmacology & therapeutics
2
360 - Social problems & services; associations
1
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