Classification
600 - Technology
630 - Agriculture & related technologies
620 - Engineering & allied operations
54
000 - Computer science, information & general works
43
333 - Economics of land & energy
37
580 - Plants (Botany)
35
700 - The arts; fine & decorative arts
34
330 - Economics
26
363 - Other social problems & services
24
610 - Medicine & health
17
900 - History & geography
16
551 - Geology, hydrology & meteorology
15
380 - Commerce, communications & transportation
12
140 - Specific philosophical schools
9
340 - Law
7
658 - General management
7
720 - Architecture
7
576 - Genetics & evolution
5
414 - Phonology & phonetics
4
581 - Specific topics in natural history
4
320 - Political science
3
612 - Human physiology
3
800 - Literature & rhetoric
3
100 - Philosophy & psychology
2
170 - Ethics
2
300 - Social sciences
2
370 - Education
2
540 - Chemistry & allied sciences
2
304 - Factors affecting social behavior
1
336 - Public finance
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
770 - Photography, photographs & computer art
1