Classification
620 - Engineering & allied operations
900 - History & geography
333 - Economics of land & energy
145
600 - Technology
144
700 - The arts; fine & decorative arts
87
363 - Other social problems & services
53
330 - Economics
52
000 - Computer science, information & general works
38
380 - Commerce, communications & transportation
37
610 - Medicine & health
28
580 - Plants (Botany)
27
370 - Education
25
320 - Political science
24
140 - Specific philosophical schools
18
576 - Genetics & evolution
16
720 - Architecture
15
500 - Natural sciences & mathematics
14
630 - Agriculture & related technologies
14
551 - Geology, hydrology & meteorology
13
300 - Social sciences
9
340 - Law
9
658 - General management
8
100 - Philosophy & psychology
7
540 - Chemistry & allied sciences
7
581 - Specific topics in natural history
6
530 - Physics
5
304 - Factors affecting social behavior
4
800 - Literature & rhetoric
4
120 - Epistemology, causation & humankind
3
170 - Ethics
3
400 - Language
3
612 - Human physiology
3
297 - Islam, Babism & Bahai Faith
2
410 - Linguistics
2
414 - Phonology & phonetics
2
200 - Religion
1
301 - Sociology & anthropology
1
657 - Accounting
1
770 - Photography, photographs & computer art
1