Classification
363 - Other social problems & services
600 - Technology
57
333 - Economics of land & energy
55
320 - Political science
51
330 - Economics
49
620 - Engineering & allied operations
49
551 - Geology, hydrology & meteorology
40
581 - Specific topics in natural history
39
700 - The arts; fine & decorative arts
34
900 - History & geography
34
140 - Specific philosophical schools
30
300 - Social sciences
30
630 - Agriculture & related technologies
19
100 - Philosophy & psychology
13
720 - Architecture
12
340 - Law
11
370 - Education
10
301 - Sociology & anthropology
9
610 - Medicine & health
8
380 - Commerce, communications & transportation
7
580 - Plants (Botany)
7
170 - Ethics
6
590 - Animals (Zoology)
5
500 - Natural sciences & mathematics
4
540 - Chemistry & allied sciences
4
000 - Computer science, information & general works
3
200 - Religion
3
530 - Physics
3
304 - Factors affecting social behavior
2
576 - Genetics & evolution
2
800 - Literature & rhetoric
2
361 - Social problems & social welfare in general
1
364 - Criminology
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1