Classification
551 - Geology, hydrology & meteorology
620 - Engineering & allied operations
160
363 - Other social problems & services
148
600 - Technology
138
900 - History & geography
79
333 - Economics of land & energy
76
700 - The arts; fine & decorative arts
70
000 - Computer science, information & general works
55
330 - Economics
44
630 - Agriculture & related technologies
43
380 - Commerce, communications & transportation
36
580 - Plants (Botany)
36
320 - Political science
32
610 - Medicine & health
27
140 - Specific philosophical schools
21
581 - Specific topics in natural history
17
500 - Natural sciences & mathematics
15
414 - Phonology & phonetics
11
576 - Genetics & evolution
11
720 - Architecture
9
370 - Education
8
540 - Chemistry & allied sciences
8
340 - Law
7
300 - Social sciences
6
658 - General management
5
800 - Literature & rhetoric
5
170 - Ethics
4
612 - Human physiology
4
304 - Factors affecting social behavior
3
530 - Physics
3
550 - Earth sciences
3
350 - Public administration & military science
2
360 - Social problems & services; associations
2
400 - Language
2
590 - Animals (Zoology)
2
100 - Philosophy & psychology
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1