Classification
551 - Geology, hydrology & meteorology
363 - Other social problems & services
463
333 - Economics of land & energy
276
000 - Computer science, information & general works
263
700 - The arts; fine & decorative arts
252
330 - Economics
225
600 - Technology
202
320 - Political science
184
620 - Engineering & allied operations
157
900 - History & geography
131
580 - Plants (Botany)
127
380 - Commerce, communications & transportation
119
610 - Medicine & health
119
581 - Specific topics in natural history
118
500 - Natural sciences & mathematics
113
140 - Specific philosophical schools
112
630 - Agriculture & related technologies
98
576 - Genetics & evolution
57
370 - Education
43
414 - Phonology & phonetics
42
300 - Social sciences
32
340 - Law
32
720 - Architecture
30
304 - Factors affecting social behavior
29
540 - Chemistry & allied sciences
27
800 - Literature & rhetoric
27
658 - General management
25
100 - Philosophy & psychology
24
530 - Physics
19
170 - Ethics
17
550 - Earth sciences
14
612 - Human physiology
14
200 - Religion
13
361 - Social problems & social welfare in general
8
400 - Language
7
350 - Public administration & military science
6
360 - Social problems & services; associations
5
120 - Epistemology, causation & humankind
4
297 - Islam, Babism & Bahai Faith
4
301 - Sociology & anthropology
4
410 - Linguistics
4
590 - Animals (Zoology)
4
657 - Accounting
4
770 - Photography, photographs & computer art
3
791 - Public performances
3
520 - Astronomy & allied sciences
2
003 - Systems
1
336 - Public finance
1
364 - Criminology
1
615 - Pharmacology & therapeutics
1
more ...