Classification
380 - Commerce, communications & transportation
600 - Technology
620 - Engineering & allied operations
351
900 - History & geography
300
700 - The arts; fine & decorative arts
278
333 - Economics of land & energy
265
000 - Computer science, information & general works
185
330 - Economics
149
363 - Other social problems & services
146
140 - Specific philosophical schools
85
610 - Medicine & health
85
320 - Political science
79
370 - Education
59
576 - Genetics & evolution
56
580 - Plants (Botany)
48
720 - Architecture
40
551 - Geology, hydrology & meteorology
37
340 - Law
36
658 - General management
35
500 - Natural sciences & mathematics
32
630 - Agriculture & related technologies
32
800 - Literature & rhetoric
26
400 - Language
25
300 - Social sciences
22
414 - Phonology & phonetics
18
530 - Physics
18
304 - Factors affecting social behavior
17
581 - Specific topics in natural history
11
100 - Philosophy & psychology
10
540 - Chemistry & allied sciences
10
410 - Linguistics
9
612 - Human physiology
8
170 - Ethics
7
200 - Religion
7
361 - Social problems & social welfare in general
7
780 - Music
7
657 - Accounting
6
791 - Public performances
6
301 - Sociology & anthropology
5
336 - Public finance
3
550 - Earth sciences
3
650 - Management & auxiliary services
3
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
364 - Criminology
1
384 - Communications; telecommunication
1
more ...