Classification
333 - Economics of land & energy
600 - Technology
551 - Geology, hydrology & meteorology
110
363 - Other social problems & services
70
620 - Engineering & allied operations
67
330 - Economics
53
700 - The arts; fine & decorative arts
49
320 - Political science
40
000 - Computer science, information & general works
39
900 - History & geography
37
610 - Medicine & health
28
380 - Commerce, communications & transportation
26
630 - Agriculture & related technologies
26
580 - Plants (Botany)
18
581 - Specific topics in natural history
17
370 - Education
15
140 - Specific philosophical schools
14
720 - Architecture
14
304 - Factors affecting social behavior
8
658 - General management
8
340 - Law
7
530 - Physics
7
500 - Natural sciences & mathematics
6
540 - Chemistry & allied sciences
5
576 - Genetics & evolution
5
800 - Literature & rhetoric
5
170 - Ethics
3
100 - Philosophy & psychology
2
200 - Religion
2
300 - Social sciences
2
350 - Public administration & military science
2
414 - Phonology & phonetics
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
400 - Language
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
657 - Accounting
1