Classification
530 - Physics
333 - Economics of land & energy
377
700 - The arts; fine & decorative arts
282
000 - Computer science, information & general works
263
620 - Engineering & allied operations
246
100 - Philosophy & psychology
168
500 - Natural sciences & mathematics
165
900 - History & geography
132
600 - Technology
124
370 - Education
77
380 - Commerce, communications & transportation
64
330 - Economics
55
200 - Religion
53
320 - Political science
52
540 - Chemistry & allied sciences
49
576 - Genetics & evolution
47
363 - Other social problems & services
45
610 - Medicine & health
42
140 - Specific philosophical schools
39
340 - Law
39
580 - Plants (Botany)
31
520 - Astronomy & allied sciences
27
300 - Social sciences
26
800 - Literature & rhetoric
26
120 - Epistemology, causation & humankind
23
170 - Ethics
23
551 - Geology, hydrology & meteorology
21
400 - Language
20
539 - Modern physics
20
301 - Sociology & anthropology
16
414 - Phonology & phonetics
13
510 - Mathematics
13
720 - Architecture
13
304 - Factors affecting social behavior
12
658 - General management
12
006 - Special computer methods
11
410 - Linguistics
11
630 - Agriculture & related technologies
11
550 - Earth sciences
10
063 - Organizations in central Europe; in Germany
8
160 - Logic
8
581 - Specific topics in natural history
8
791 - Public performances
7
296 - Judaism
6
331 - Labor economics
6
780 - Music
6
003 - Systems
5
297 - Islam, Babism & Bahai Faith
4
519 - Probabilities & applied mathematics
4
621 - Applied physics
4
more ...