Classification
000 - Computer science, information & general works
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
115
620 - Engineering & allied operations
86
333 - Economics of land & energy
61
363 - Other social problems & services
50
630 - Agriculture & related technologies
49
140 - Specific philosophical schools
43
330 - Economics
43
580 - Plants (Botany)
37
900 - History & geography
36
380 - Commerce, communications & transportation
35
370 - Education
23
576 - Genetics & evolution
18
551 - Geology, hydrology & meteorology
17
500 - Natural sciences & mathematics
16
658 - General management
16
320 - Political science
15
720 - Architecture
15
170 - Ethics
10
400 - Language
10
540 - Chemistry & allied sciences
10
581 - Specific topics in natural history
10
340 - Law
8
414 - Phonology & phonetics
8
530 - Physics
8
300 - Social sciences
7
361 - Social problems & social welfare in general
7
612 - Human physiology
6
800 - Literature & rhetoric
6
615 - Pharmacology & therapeutics
5
100 - Philosophy & psychology
4
304 - Factors affecting social behavior
4
410 - Linguistics
4
301 - Sociology & anthropology
2
360 - Social problems & services; associations
2
780 - Music
2
001 - Knowledge
1
200 - Religion
1
350 - Public administration & military science
1
364 - Criminology
1
520 - Astronomy & allied sciences
1