Classification
610 - Medicine & health
860
600 - Technology
567
330 - Economics
555
700 - The arts; fine & decorative arts
521
363 - Other social problems & services
436
333 - Economics of land & energy
413
000 - Computer science, information & general works
349
620 - Engineering & allied operations
311
900 - History & geography
274
370 - Education
226
140 - Specific philosophical schools
177
380 - Commerce, communications & transportation
177
320 - Political science
169
658 - General management
151
580 - Plants (Botany)
148
371 - Schools & their activities; special education
127
551 - Geology, hydrology & meteorology
121
340 - Law
103
500 - Natural sciences & mathematics
98
100 - Philosophy & psychology
83
630 - Agriculture & related technologies
69
576 - Genetics & evolution
63
540 - Chemistry & allied sciences
57
368 - Insurance
54
300 - Social sciences
52
720 - Architecture
42
400 - Language
41
800 - Literature & rhetoric
40
170 - Ethics
37
414 - Phonology & phonetics
36
581 - Specific topics in natural history
35
304 - Factors affecting social behavior
31
615 - Pharmacology & therapeutics
29
332 - Financial economics
27
338 - Production
27
612 - Human physiology
25
530 - Physics
24
616 - Diseases
23
361 - Social problems & social welfare in general
21
362 - Social welfare problems & services
20
331 - Labor economics
19
628 - Sanitary & municipal engineering
19
005 - Computer programming, programs & data
18
570 - Life sciences; biology
18
577 - Ecology
17
410 - Linguistics
16
155 - Differential & developmental psychology
14
378 - Higher education
12
418 - Standard usage & applied linguistics
12
519 - Probabilities & applied mathematics
12
more ...