Classification
320 - Political science
380 - Commerce, communications & transportation
610 - Medicine & health
333 - Economics of land & energy
18
700 - The arts; fine & decorative arts
17
304 - Factors affecting social behavior
14
330 - Economics
13
363 - Other social problems & services
13
600 - Technology
13
000 - Computer science, information & general works
12
140 - Specific philosophical schools
9
370 - Education
9
551 - Geology, hydrology & meteorology
7
900 - History & geography
6
720 - Architecture
5
620 - Engineering & allied operations
4
400 - Language
3
576 - Genetics & evolution
3
658 - General management
3
100 - Philosophy & psychology
2
170 - Ethics
2
300 - Social sciences
2
340 - Law
2
410 - Linguistics
2
581 - Specific topics in natural history
2
200 - Religion
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
630 - Agriculture & related technologies
1