Classification
333 - Economics of land & energy
600 - Technology
118
700 - The arts; fine & decorative arts
108
330 - Economics
99
320 - Political science
97
620 - Engineering & allied operations
93
000 - Computer science, information & general works
87
363 - Other social problems & services
85
610 - Medicine & health
72
900 - History & geography
70
380 - Commerce, communications & transportation
65
580 - Plants (Botany)
36
576 - Genetics & evolution
33
630 - Agriculture & related technologies
30
140 - Specific philosophical schools
26
551 - Geology, hydrology & meteorology
24
304 - Factors affecting social behavior
23
500 - Natural sciences & mathematics
23
340 - Law
21
530 - Physics
17
540 - Chemistry & allied sciences
17
581 - Specific topics in natural history
16
300 - Social sciences
13
370 - Education
13
612 - Human physiology
13
720 - Architecture
13
414 - Phonology & phonetics
12
621 - Applied physics
10
100 - Philosophy & psychology
9
800 - Literature & rhetoric
8
338 - Production
6
361 - Social problems & social welfare in general
6
400 - Language
4
658 - General management
4
170 - Ethics
3
200 - Religion
3
301 - Sociology & anthropology
3
336 - Public finance
3
510 - Mathematics
2
615 - Pharmacology & therapeutics
2
780 - Music
2
297 - Islam, Babism & Bahai Faith
1
302 - Social interaction
1
303 - Social processes
1
350 - Public administration & military science
1
364 - Criminology
1
371 - Schools & their activities; special education
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
more ...