Classification
330 - Economics
363 - Other social problems & services
900 - History & geography
600 - Technology
90
620 - Engineering & allied operations
86
333 - Economics of land & energy
82
700 - The arts; fine & decorative arts
58
000 - Computer science, information & general works
43
380 - Commerce, communications & transportation
34
320 - Political science
29
551 - Geology, hydrology & meteorology
24
610 - Medicine & health
22
581 - Specific topics in natural history
20
140 - Specific philosophical schools
18
370 - Education
18
580 - Plants (Botany)
15
720 - Architecture
15
300 - Social sciences
9
658 - General management
9
340 - Law
8
576 - Genetics & evolution
8
630 - Agriculture & related technologies
7
800 - Literature & rhetoric
6
200 - Religion
4
301 - Sociology & anthropology
4
304 - Factors affecting social behavior
4
400 - Language
4
414 - Phonology & phonetics
4
100 - Philosophy & psychology
3
170 - Ethics
3
530 - Physics
3
297 - Islam, Babism & Bahai Faith
2
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
657 - Accounting
2
350 - Public administration & military science
1
360 - Social problems & services; associations
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
590 - Animals (Zoology)
1
615 - Pharmacology & therapeutics
1