Classification
600 - Technology
113
620 - Engineering & allied operations
88
700 - The arts; fine & decorative arts
78
333 - Economics of land & energy
73
900 - History & geography
73
000 - Computer science, information & general works
43
363 - Other social problems & services
37
330 - Economics
33
580 - Plants (Botany)
26
380 - Commerce, communications & transportation
23
576 - Genetics & evolution
22
610 - Medicine & health
18
540 - Chemistry & allied sciences
15
551 - Geology, hydrology & meteorology
15
414 - Phonology & phonetics
14
500 - Natural sciences & mathematics
14
530 - Physics
11
320 - Political science
10
140 - Specific philosophical schools
9
340 - Law
9
304 - Factors affecting social behavior
7
660 - Chemical engineering
7
630 - Agriculture & related technologies
6
658 - General management
5
800 - Literature & rhetoric
4
100 - Philosophy & psychology
3
361 - Social problems & social welfare in general
3
370 - Education
3
612 - Human physiology
3
662 - Explosives, fuels & related products
3
581 - Specific topics in natural history
2
720 - Architecture
2
200 - Religion
1
301 - Sociology & anthropology
1
390 - Customs, etiquette & folklore
1
400 - Language
1
553 - Economic geology
1
604 - Special topics
1
615 - Pharmacology & therapeutics
1
640 - Home & family management
1
647 - Management of public households
1
650 - Management & auxiliary services
1
665 - Industrial oils, fats, waxes & gases
1
668 - Technology of other organic products
1