Classification
600 - Technology
117
700 - The arts; fine & decorative arts
117
620 - Engineering & allied operations
98
900 - History & geography
90
333 - Economics of land & energy
84
000 - Computer science, information & general works
71
610 - Medicine & health
51
363 - Other social problems & services
50
380 - Commerce, communications & transportation
34
140 - Specific philosophical schools
33
330 - Economics
24
580 - Plants (Botany)
24
576 - Genetics & evolution
19
551 - Geology, hydrology & meteorology
16
320 - Political science
15
414 - Phonology & phonetics
15
540 - Chemistry & allied sciences
15
720 - Architecture
15
304 - Factors affecting social behavior
10
500 - Natural sciences & mathematics
10
340 - Law
9
530 - Physics
8
400 - Language
7
630 - Agriculture & related technologies
7
370 - Education
6
410 - Linguistics
5
570 - Life sciences; biology
4
621 - Applied physics
4
658 - General management
4
384 - Communications; telecommunication
3
581 - Specific topics in natural history
3
100 - Philosophy & psychology
2
170 - Ethics
2
331 - Labor economics
2
612 - Human physiology
2
650 - Management & auxiliary services
2
800 - Literature & rhetoric
2
301 - Sociology & anthropology
1
302 - Social interaction
1
415 - Grammar
1
616 - Diseases
1
660 - Chemical engineering
1
770 - Photography, photographs & computer art
1
791 - Public performances
1
820 - English & Old English literatures
1
943 - Central Europe; Germany
1