Classification
380 - Commerce, communications & transportation
600 - Technology
620 - Engineering & allied operations
380
900 - History & geography
321
700 - The arts; fine & decorative arts
295
333 - Economics of land & energy
281
000 - Computer science, information & general works
216
330 - Economics
167
363 - Other social problems & services
156
140 - Specific philosophical schools
90
610 - Medicine & health
89
320 - Political science
87
370 - Education
65
576 - Genetics & evolution
60
580 - Plants (Botany)
49
630 - Agriculture & related technologies
44
720 - Architecture
43
300 - Social sciences
41
340 - Law
40
658 - General management
40
500 - Natural sciences & mathematics
39
551 - Geology, hydrology & meteorology
39
400 - Language
28
800 - Literature & rhetoric
27
530 - Physics
21
304 - Factors affecting social behavior
20
540 - Chemistry & allied sciences
19
414 - Phonology & phonetics
18
100 - Philosophy & psychology
14
581 - Specific topics in natural history
11
410 - Linguistics
10
780 - Music
9
170 - Ethics
8
200 - Religion
8
301 - Sociology & anthropology
8
612 - Human physiology
8
361 - Social problems & social welfare in general
7
657 - Accounting
6
336 - Public finance
4
550 - Earth sciences
3
650 - Management & auxiliary services
3
791 - Public performances
3
364 - Criminology
2
520 - Astronomy & allied sciences
2
615 - Pharmacology & therapeutics
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
160 - Logic
1
350 - Public administration & military science
1
384 - Communications; telecommunication
1
more ...