Classification
363 - Other social problems & services
600 - Technology
59
620 - Engineering & allied operations
52
330 - Economics
51
333 - Economics of land & energy
49
320 - Political science
46
900 - History & geography
44
551 - Geology, hydrology & meteorology
37
581 - Specific topics in natural history
37
700 - The arts; fine & decorative arts
36
140 - Specific philosophical schools
32
300 - Social sciences
31
630 - Agriculture & related technologies
18
340 - Law
13
100 - Philosophy & psychology
12
540 - Chemistry & allied sciences
11
370 - Education
10
720 - Architecture
10
301 - Sociology & anthropology
8
580 - Plants (Botany)
8
610 - Medicine & health
8
170 - Ethics
6
380 - Commerce, communications & transportation
6
500 - Natural sciences & mathematics
5
800 - Literature & rhetoric
5
590 - Animals (Zoology)
4
200 - Religion
3
530 - Physics
3
000 - Computer science, information & general works
2
304 - Factors affecting social behavior
2
410 - Linguistics
2
576 - Genetics & evolution
2
361 - Social problems & social welfare in general
1
364 - Criminology
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1