Classification
333 - Economics of land & energy
338 - Production
73
700 - The arts; fine & decorative arts
58
000 - Computer science, information & general works
38
600 - Technology
37
620 - Engineering & allied operations
36
610 - Medicine & health
31
900 - History & geography
30
580 - Plants (Botany)
25
363 - Other social problems & services
23
576 - Genetics & evolution
19
621 - Applied physics
18
140 - Specific philosophical schools
17
330 - Economics
16
380 - Commerce, communications & transportation
15
540 - Chemistry & allied sciences
11
551 - Geology, hydrology & meteorology
10
370 - Education
8
500 - Natural sciences & mathematics
8
530 - Physics
8
414 - Phonology & phonetics
7
581 - Specific topics in natural history
7
720 - Architecture
7
100 - Philosophy & psychology
6
320 - Political science
5
612 - Human physiology
5
304 - Factors affecting social behavior
4
630 - Agriculture & related technologies
4
300 - Social sciences
3
800 - Literature & rhetoric
3
302 - Social interaction
2
340 - Law
2
658 - General management
2
001 - Knowledge
1
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
331 - Labor economics
1
361 - Social problems & social welfare in general
1
400 - Language
1
520 - Astronomy & allied sciences
1
615 - Pharmacology & therapeutics
1
625 - Engineering of railroads & roads
1
657 - Accounting
1
745 - Decorative arts
1
770 - Photography, photographs & computer art
1