Classification
330 - Economics
148
630 - Agriculture & related technologies
66
363 - Other social problems & services
62
333 - Economics of land & energy
57
610 - Medicine & health
45
580 - Plants (Botany)
44
000 - Computer science, information & general works
43
551 - Geology, hydrology & meteorology
42
600 - Technology
41
700 - The arts; fine & decorative arts
34
620 - Engineering & allied operations
30
380 - Commerce, communications & transportation
22
320 - Political science
20
581 - Specific topics in natural history
18
664 - Food technology
18
338 - Production
16
304 - Factors affecting social behavior
15
641 - Food & drink
15
140 - Specific philosophical schools
13
370 - Education
10
658 - General management
10
500 - Natural sciences & mathematics
9
300 - Social sciences
8
900 - History & geography
8
340 - Law
7
576 - Genetics & evolution
7
540 - Chemistry & allied sciences
6
612 - Human physiology
5
361 - Social problems & social welfare in general
4
414 - Phonology & phonetics
4
800 - Literature & rhetoric
4
613 - Personal health & safety
3
720 - Architecture
3
200 - Religion
2
331 - Labor economics
2
570 - Life sciences; biology
2
577 - Ecology
2
657 - Accounting
2
006 - Special computer methods
1
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
303 - Social processes
1
332 - Financial economics
1
343 - Military, tax, trade & industrial law
1
382 - International commerce
1
400 - Language
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
more ...