Classification
620 - Engineering & allied operations
363 - Other social problems & services
31
700 - The arts; fine & decorative arts
31
600 - Technology
29
630 - Agriculture & related technologies
25
500 - Natural sciences & mathematics
18
330 - Economics
11
414 - Phonology & phonetics
10
551 - Geology, hydrology & meteorology
9
333 - Economics of land & energy
7
900 - History & geography
6
300 - Social sciences
5
910 - Geography & travel
5
320 - Political science
4
526 - Mathematical geography
4
540 - Chemistry & allied sciences
4
581 - Specific topics in natural history
4
000 - Computer science, information & general works
3
610 - Medicine & health
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
301 - Sociology & anthropology
2
510 - Mathematics
2
530 - Physics
2
550 - Earth sciences
2
720 - Architecture
2
170 - Ethics
1
200 - Religion
1
338 - Production
1
340 - Law
1
350 - Public administration & military science
1
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
519 - Probabilities & applied mathematics
1
549 - Mineralogy
1
580 - Plants (Botany)
1
681 - Precision instruments & other devices
1
741 - Drawing & drawings
1