Classification
330 - Economics
869
600 - Technology
148
700 - The arts; fine & decorative arts
127
620 - Engineering & allied operations
115
333 - Economics of land & energy
114
000 - Computer science, information & general works
94
900 - History & geography
91
540 - Chemistry & allied sciences
68
340 - Law
60
332 - Financial economics
49
363 - Other social problems & services
38
320 - Political science
35
610 - Medicine & health
34
380 - Commerce, communications & transportation
30
541 - Physical chemistry
27
414 - Phonology & phonetics
24
576 - Genetics & evolution
23
580 - Plants (Botany)
23
140 - Specific philosophical schools
21
530 - Physics
15
547 - Organic chemistry
15
500 - Natural sciences & mathematics
12
546 - Inorganic chemistry
12
800 - Literature & rhetoric
11
304 - Factors affecting social behavior
9
100 - Philosophy & psychology
6
820 - English & Old English literatures
6
543 - Analytical chemistry
5
615 - Pharmacology & therapeutics
5
668 - Technology of other organic products
5
720 - Architecture
5
370 - Education
4
621 - Applied physics
4
170 - Ethics
3
200 - Religion
3
574 - [Unassigned]
3
658 - General management
3
300 - Social sciences
2
301 - Sociology & anthropology
2
336 - Public finance
2
361 - Social problems & social welfare in general
2
535 - Light & infrared & ultraviolet phenomena
2
551 - Geology, hydrology & meteorology
2
572 - Biochemistry
2
581 - Specific topics in natural history
2
660 - Chemical engineering
2
661 - Industrial chemicals
2
153 - Mental processes & intelligence
1
160 - Logic
1
339 - Macroeconomics & related topics
1
more ...