Classification
330 - Economics
363 - Other social problems & services
658 - General management
333 - Economics of land & energy
31
000 - Computer science, information & general works
29
700 - The arts; fine & decorative arts
29
600 - Technology
28
620 - Engineering & allied operations
20
380 - Commerce, communications & transportation
18
320 - Political science
16
500 - Natural sciences & mathematics
16
610 - Medicine & health
16
551 - Geology, hydrology & meteorology
12
580 - Plants (Botany)
11
900 - History & geography
9
140 - Specific philosophical schools
8
630 - Agriculture & related technologies
7
370 - Education
6
576 - Genetics & evolution
6
100 - Philosophy & psychology
4
720 - Architecture
4
800 - Literature & rhetoric
4
331 - Labor economics
3
340 - Law
3
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
300 - Social sciences
2
338 - Production
2
361 - Social problems & social welfare in general
2
364 - Criminology
2
400 - Language
2
530 - Physics
2
581 - Specific topics in natural history
2
001 - Knowledge
1
160 - Logic
1
200 - Religion
1
302 - Social interaction
1
304 - Factors affecting social behavior
1
336 - Public finance
1
350 - Public administration & military science
1
368 - Insurance
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
670 - Manufacturing
1