Classification
551 - Geology, hydrology & meteorology
363 - Other social problems & services
611
333 - Economics of land & energy
302
700 - The arts; fine & decorative arts
284
000 - Computer science, information & general works
267
330 - Economics
242
600 - Technology
220
320 - Political science
219
620 - Engineering & allied operations
166
900 - History & geography
142
580 - Plants (Botany)
132
610 - Medicine & health
130
581 - Specific topics in natural history
128
380 - Commerce, communications & transportation
125
140 - Specific philosophical schools
120
500 - Natural sciences & mathematics
115
630 - Agriculture & related technologies
110
576 - Genetics & evolution
60
414 - Phonology & phonetics
55
300 - Social sciences
52
370 - Education
51
720 - Architecture
38
340 - Law
35
304 - Factors affecting social behavior
32
540 - Chemistry & allied sciences
30
100 - Philosophy & psychology
28
800 - Literature & rhetoric
28
658 - General management
25
530 - Physics
21
170 - Ethics
18
550 - Earth sciences
16
612 - Human physiology
14
200 - Religion
13
400 - Language
10
361 - Social problems & social welfare in general
8
301 - Sociology & anthropology
6
350 - Public administration & military science
6
590 - Animals (Zoology)
6
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
4
520 - Astronomy & allied sciences
2
791 - Public performances
2
003 - Systems
1
336 - Public finance
1
364 - Criminology
1
559 - Earth sciences of other areas
1
more ...