Classification
370 - Education
900 - History & geography
333 - Economics of land & energy
24
700 - The arts; fine & decorative arts
18
363 - Other social problems & services
15
600 - Technology
13
330 - Economics
10
380 - Commerce, communications & transportation
9
620 - Engineering & allied operations
8
000 - Computer science, information & general works
7
320 - Political science
7
551 - Geology, hydrology & meteorology
6
610 - Medicine & health
6
100 - Philosophy & psychology
4
140 - Specific philosophical schools
4
720 - Architecture
4
340 - Law
3
581 - Specific topics in natural history
3
200 - Religion
2
304 - Factors affecting social behavior
2
630 - Agriculture & related technologies
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
300 - Social sciences
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
400 - Language
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
658 - General management
1
800 - Literature & rhetoric
1