Classification
333 - Economics of land & energy
600 - Technology
620 - Engineering & allied operations
895
700 - The arts; fine & decorative arts
697
900 - History & geography
684
330 - Economics
440
363 - Other social problems & services
396
000 - Computer science, information & general works
383
380 - Commerce, communications & transportation
272
610 - Medicine & health
213
320 - Political science
184
580 - Plants (Botany)
182
576 - Genetics & evolution
121
140 - Specific philosophical schools
120
630 - Agriculture & related technologies
120
551 - Geology, hydrology & meteorology
111
370 - Education
103
500 - Natural sciences & mathematics
98
540 - Chemistry & allied sciences
80
720 - Architecture
65
581 - Specific topics in natural history
56
340 - Law
52
800 - Literature & rhetoric
52
530 - Physics
51
658 - General management
48
414 - Phonology & phonetics
47
304 - Factors affecting social behavior
38
300 - Social sciences
31
100 - Philosophy & psychology
22
400 - Language
22
170 - Ethics
17
657 - Accounting
14
410 - Linguistics
10
200 - Religion
9
612 - Human physiology
9
301 - Sociology & anthropology
6
361 - Social problems & social welfare in general
6
770 - Photography, photographs & computer art
6
336 - Public finance
5
350 - Public administration & military science
5
780 - Music
5
297 - Islam, Babism & Bahai Faith
4
550 - Earth sciences
4
650 - Management & auxiliary services
4
120 - Epistemology, causation & humankind
3
160 - Logic
3
520 - Astronomy & allied sciences
3
615 - Pharmacology & therapeutics
2
791 - Public performances
2
360 - Social problems & services; associations
1
more ...