Classification
330 - Economics
551 - Geology, hydrology & meteorology
600 - Technology
333 - Economics of land & energy
54
363 - Other social problems & services
50
620 - Engineering & allied operations
40
700 - The arts; fine & decorative arts
32
000 - Computer science, information & general works
30
320 - Political science
29
610 - Medicine & health
23
630 - Agriculture & related technologies
23
380 - Commerce, communications & transportation
20
900 - History & geography
20
580 - Plants (Botany)
16
140 - Specific philosophical schools
12
581 - Specific topics in natural history
12
370 - Education
9
658 - General management
7
304 - Factors affecting social behavior
6
720 - Architecture
6
340 - Law
3
540 - Chemistry & allied sciences
3
800 - Literature & rhetoric
3
200 - Religion
2
300 - Social sciences
2
350 - Public administration & military science
2
360 - Social problems & services; associations
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
530 - Physics
2
576 - Genetics & evolution
2
100 - Philosophy & psychology
1
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
657 - Accounting
1