Classification
610 - Medicine & health
99
700 - The arts; fine & decorative arts
57
333 - Economics of land & energy
37
000 - Computer science, information & general works
35
370 - Education
32
330 - Economics
28
380 - Commerce, communications & transportation
27
140 - Specific philosophical schools
23
600 - Technology
23
300 - Social sciences
22
363 - Other social problems & services
18
320 - Political science
17
580 - Plants (Botany)
17
100 - Philosophy & psychology
15
900 - History & geography
11
340 - Law
10
612 - Human physiology
9
620 - Engineering & allied operations
9
301 - Sociology & anthropology
7
304 - Factors affecting social behavior
7
551 - Geology, hydrology & meteorology
7
780 - Music
7
658 - General management
5
770 - Photography, photographs & computer art
5
800 - Literature & rhetoric
5
820 - English & Old English literatures
5
581 - Specific topics in natural history
4
630 - Agriculture & related technologies
4
778 - Fields & kinds of photography
4
006 - Special computer methods
3
400 - Language
3
500 - Natural sciences & mathematics
3
160 - Logic
2
170 - Ethics
2
306 - Culture & institutions
2
361 - Social problems & social welfare in general
2
410 - Linguistics
2
540 - Chemistry & allied sciences
2
576 - Genetics & evolution
2
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
010 - Bibliography
1
128 - Humankind
1
153 - Mental processes & intelligence
1
331 - Labor economics
1
339 - Macroeconomics & related topics
1
360 - Social problems & services; associations
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
570 - Life sciences; biology
1
more ...