Classification
530 - Physics
100 - Philosophy & psychology
19
500 - Natural sciences & mathematics
19
333 - Economics of land & energy
14
700 - The arts; fine & decorative arts
13
200 - Religion
9
600 - Technology
8
900 - History & geography
8
363 - Other social problems & services
6
520 - Astronomy & allied sciences
5
540 - Chemistry & allied sciences
5
000 - Computer science, information & general works
4
320 - Political science
4
581 - Specific topics in natural history
4
620 - Engineering & allied operations
4
170 - Ethics
3
301 - Sociology & anthropology
3
580 - Plants (Botany)
3
800 - Literature & rhetoric
3
120 - Epistemology, causation & humankind
2
140 - Specific philosophical schools
2
296 - Judaism
2
300 - Social sciences
2
340 - Law
2
370 - Education
2
380 - Commerce, communications & transportation
2
400 - Language
2
630 - Agriculture & related technologies
2
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
330 - Economics
1
346 - Private law
1
410 - Linguistics
1
510 - Mathematics
1
519 - Probabilities & applied mathematics
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
791 - Public performances
1