Classification
551 - Geology, hydrology & meteorology
620 - Engineering & allied operations
600 - Technology
136
363 - Other social problems & services
99
900 - History & geography
79
333 - Economics of land & energy
72
700 - The arts; fine & decorative arts
59
000 - Computer science, information & general works
45
330 - Economics
38
630 - Agriculture & related technologies
38
380 - Commerce, communications & transportation
32
580 - Plants (Botany)
31
320 - Political science
30
610 - Medicine & health
22
140 - Specific philosophical schools
19
581 - Specific topics in natural history
16
500 - Natural sciences & mathematics
12
576 - Genetics & evolution
11
414 - Phonology & phonetics
10
720 - Architecture
9
540 - Chemistry & allied sciences
7
300 - Social sciences
6
340 - Law
6
370 - Education
6
170 - Ethics
4
612 - Human physiology
4
658 - General management
4
304 - Factors affecting social behavior
3
530 - Physics
3
800 - Literature & rhetoric
3
350 - Public administration & military science
2
550 - Earth sciences
2
590 - Animals (Zoology)
2
100 - Philosophy & psychology
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
400 - Language
1
410 - Linguistics
1