Classification
620 - Engineering & allied operations
600 - Technology
73
900 - History & geography
61
700 - The arts; fine & decorative arts
60
333 - Economics of land & energy
43
000 - Computer science, information & general works
32
380 - Commerce, communications & transportation
27
363 - Other social problems & services
24
610 - Medicine & health
22
576 - Genetics & evolution
18
330 - Economics
17
551 - Geology, hydrology & meteorology
14
580 - Plants (Botany)
12
140 - Specific philosophical schools
11
500 - Natural sciences & mathematics
10
630 - Agriculture & related technologies
10
720 - Architecture
9
540 - Chemistry & allied sciences
5
414 - Phonology & phonetics
4
300 - Social sciences
3
320 - Political science
3
581 - Specific topics in natural history
3
612 - Human physiology
3
658 - General management
3
340 - Law
2
361 - Social problems & social welfare in general
2
370 - Education
2
400 - Language
2
800 - Literature & rhetoric
2
542 - Techniques, equipment & materials
1
550 - Earth sciences
1
650 - Management & auxiliary services
1
770 - Photography, photographs & computer art
1