Classification
576 - Genetics & evolution
620 - Engineering & allied operations
197
600 - Technology
155
900 - History & geography
124
700 - The arts; fine & decorative arts
120
333 - Economics of land & energy
86
000 - Computer science, information & general works
69
363 - Other social problems & services
52
380 - Commerce, communications & transportation
49
330 - Economics
36
610 - Medicine & health
35
580 - Plants (Botany)
31
500 - Natural sciences & mathematics
27
140 - Specific philosophical schools
21
720 - Architecture
21
340 - Law
18
414 - Phonology & phonetics
18
800 - Literature & rhetoric
16
630 - Agriculture & related technologies
14
540 - Chemistry & allied sciences
13
320 - Political science
12
658 - General management
12
551 - Geology, hydrology & meteorology
11
304 - Factors affecting social behavior
10
300 - Social sciences
9
370 - Education
8
400 - Language
8
530 - Physics
7
581 - Specific topics in natural history
6
100 - Philosophy & psychology
5
410 - Linguistics
4
612 - Human physiology
4
170 - Ethics
3
301 - Sociology & anthropology
3
770 - Photography, photographs & computer art
3
791 - Public performances
2
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
331 - Labor economics
1
361 - Social problems & social welfare in general
1
550 - Earth sciences
1
570 - Life sciences; biology
1
650 - Management & auxiliary services
1
657 - Accounting
1
745 - Decorative arts
1
780 - Music
1