Classification
330 - Economics
1,067
600 - Technology
415
700 - The arts; fine & decorative arts
396
620 - Engineering & allied operations
319
000 - Computer science, information & general works
297
333 - Economics of land & energy
263
900 - History & geography
241
610 - Medicine & health
148
363 - Other social problems & services
115
580 - Plants (Botany)
112
380 - Commerce, communications & transportation
106
576 - Genetics & evolution
92
500 - Natural sciences & mathematics
88
540 - Chemistry & allied sciences
86
140 - Specific philosophical schools
71
414 - Phonology & phonetics
58
530 - Physics
53
340 - Law
42
551 - Geology, hydrology & meteorology
39
320 - Political science
28
720 - Architecture
28
630 - Agriculture & related technologies
24
304 - Factors affecting social behavior
21
658 - General management
21
800 - Literature & rhetoric
21
621 - Applied physics
19
581 - Specific topics in natural history
18
547 - Organic chemistry
17
612 - Human physiology
16
664 - Food technology
15
615 - Pharmacology & therapeutics
14
338 - Production
12
515 - Analysis
12
541 - Physical chemistry
12
332 - Financial economics
10
370 - Education
10
546 - Inorganic chemistry
10
339 - Macroeconomics & related topics
9
660 - Chemical engineering
9
668 - Technology of other organic products
9
300 - Social sciences
8
570 - Life sciences; biology
7
355 - Military science
6
400 - Language
6
629 - Other branches of engineering
6
303 - Social processes
5
410 - Linguistics
5
628 - Sanitary & municipal engineering
5
003 - Systems
4
661 - Industrial chemicals
4
more ...