Classification
551 - Geology, hydrology & meteorology
363 - Other social problems & services
591
333 - Economics of land & energy
286
700 - The arts; fine & decorative arts
270
000 - Computer science, information & general works
265
330 - Economics
233
600 - Technology
212
320 - Political science
194
620 - Engineering & allied operations
164
900 - History & geography
134
580 - Plants (Botany)
130
610 - Medicine & health
126
380 - Commerce, communications & transportation
120
581 - Specific topics in natural history
120
500 - Natural sciences & mathematics
115
140 - Specific philosophical schools
113
630 - Agriculture & related technologies
106
576 - Genetics & evolution
57
370 - Education
47
414 - Phonology & phonetics
47
300 - Social sciences
36
340 - Law
33
720 - Architecture
31
540 - Chemistry & allied sciences
30
304 - Factors affecting social behavior
29
800 - Literature & rhetoric
27
658 - General management
26
100 - Philosophy & psychology
25
530 - Physics
19
170 - Ethics
17
550 - Earth sciences
16
612 - Human physiology
14
200 - Religion
13
400 - Language
10
361 - Social problems & social welfare in general
8
350 - Public administration & military science
6
590 - Animals (Zoology)
6
301 - Sociology & anthropology
5
360 - Social problems & services; associations
5
120 - Epistemology, causation & humankind
4
297 - Islam, Babism & Bahai Faith
4
410 - Linguistics
4
657 - Accounting
4
770 - Photography, photographs & computer art
3
520 - Astronomy & allied sciences
2
791 - Public performances
2
003 - Systems
1
331 - Labor economics
1
336 - Public finance
1
364 - Criminology
1
more ...