Classification
620 - Engineering & allied operations
900 - History & geography
600 - Technology
439
700 - The arts; fine & decorative arts
277
333 - Economics of land & energy
229
380 - Commerce, communications & transportation
118
000 - Computer science, information & general works
109
363 - Other social problems & services
88
330 - Economics
83
610 - Medicine & health
60
580 - Plants (Botany)
54
140 - Specific philosophical schools
53
576 - Genetics & evolution
47
720 - Architecture
40
500 - Natural sciences & mathematics
32
340 - Law
31
320 - Political science
18
530 - Physics
17
630 - Agriculture & related technologies
15
658 - General management
15
414 - Phonology & phonetics
14
551 - Geology, hydrology & meteorology
14
370 - Education
13
400 - Language
13
800 - Literature & rhetoric
13
540 - Chemistry & allied sciences
9
304 - Factors affecting social behavior
8
100 - Philosophy & psychology
4
170 - Ethics
4
300 - Social sciences
4
770 - Photography, photographs & computer art
4
410 - Linguistics
3
581 - Specific topics in natural history
3
120 - Epistemology, causation & humankind
2
160 - Logic
2
550 - Earth sciences
2
780 - Music
2
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
650 - Management & auxiliary services
1
657 - Accounting
1
791 - Public performances
1