Classification
363 - Other social problems & services
600 - Technology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
900 - History & geography
167
333 - Economics of land & energy
126
330 - Economics
69
000 - Computer science, information & general works
59
380 - Commerce, communications & transportation
54
580 - Plants (Botany)
54
610 - Medicine & health
50
630 - Agriculture & related technologies
50
140 - Specific philosophical schools
40
551 - Geology, hydrology & meteorology
39
320 - Political science
28
576 - Genetics & evolution
23
720 - Architecture
23
540 - Chemistry & allied sciences
22
414 - Phonology & phonetics
21
370 - Education
19
500 - Natural sciences & mathematics
14
581 - Specific topics in natural history
13
800 - Literature & rhetoric
13
340 - Law
12
658 - General management
12
300 - Social sciences
10
400 - Language
10
100 - Philosophy & psychology
8
170 - Ethics
5
304 - Factors affecting social behavior
5
530 - Physics
4
612 - Human physiology
3
200 - Religion
2
301 - Sociology & anthropology
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
160 - Logic
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
398 - Folklore
1
410 - Linguistics
1
550 - Earth sciences
1
615 - Pharmacology & therapeutics
1
657 - Accounting
1