Classification
000 - Computer science, information & general works
600 - Technology
700 - The arts; fine & decorative arts
476
620 - Engineering & allied operations
449
333 - Economics of land & energy
376
900 - History & geography
276
330 - Economics
236
610 - Medicine & health
192
363 - Other social problems & services
191
380 - Commerce, communications & transportation
191
630 - Agriculture & related technologies
138
140 - Specific philosophical schools
135
580 - Plants (Botany)
124
576 - Genetics & evolution
116
320 - Political science
78
370 - Education
76
658 - General management
66
500 - Natural sciences & mathematics
65
720 - Architecture
62
551 - Geology, hydrology & meteorology
56
400 - Language
53
530 - Physics
41
340 - Law
40
540 - Chemistry & allied sciences
40
800 - Literature & rhetoric
37
100 - Philosophy & psychology
32
300 - Social sciences
31
414 - Phonology & phonetics
28
581 - Specific topics in natural history
25
170 - Ethics
23
410 - Linguistics
22
612 - Human physiology
17
304 - Factors affecting social behavior
16
361 - Social problems & social welfare in general
15
657 - Accounting
14
331 - Labor economics
10
780 - Music
9
301 - Sociology & anthropology
8
200 - Religion
7
520 - Astronomy & allied sciences
6
615 - Pharmacology & therapeutics
6
770 - Photography, photographs & computer art
6
350 - Public administration & military science
5
120 - Epistemology, causation & humankind
3
160 - Logic
3
338 - Production
3
650 - Management & auxiliary services
3
360 - Social problems & services; associations
2
374 - Adult education
2
550 - Earth sciences
2
more ...