Classification
330 - Economics
169
610 - Medicine & health
167
300 - Social sciences
92
700 - The arts; fine & decorative arts
86
320 - Political science
84
000 - Computer science, information & general works
49
333 - Economics of land & energy
36
363 - Other social problems & services
33
140 - Specific philosophical schools
27
580 - Plants (Botany)
27
370 - Education
21
380 - Commerce, communications & transportation
18
900 - History & geography
16
551 - Geology, hydrology & meteorology
15
600 - Technology
15
304 - Factors affecting social behavior
14
340 - Law
13
581 - Specific topics in natural history
11
540 - Chemistry & allied sciences
10
570 - Life sciences; biology
10
576 - Genetics & evolution
10
800 - Literature & rhetoric
10
500 - Natural sciences & mathematics
8
612 - Human physiology
8
620 - Engineering & allied operations
8
361 - Social problems & social welfare in general
7
362 - Social welfare problems & services
7
615 - Pharmacology & therapeutics
7
658 - General management
6
100 - Philosophy & psychology
5
414 - Phonology & phonetics
5
170 - Ethics
4
360 - Social problems & services; associations
4
630 - Agriculture & related technologies
4
230 - Christianity & Christian theology
3
301 - Sociology & anthropology
3
400 - Language
3
920 - Biography, genealogy & insignia
3
410 - Linguistics
2
530 - Physics
2
640 - Home & family management
2
720 - Architecture
2
820 - English & Old English literatures
2
150 - Psychology
1
200 - Religion
1
240 - Christian moral & devotional theology
1
260 - Social & ecclesiastical theology
1
280 - Christian denominations & sects
1
303 - Social processes
1
336 - Public finance
1
more ...