Classification
305 - Social groups
721
610 - Medicine & health
633
900 - History & geography
442
306 - Culture & institutions
414
700 - The arts; fine & decorative arts
391
330 - Economics
247
600 - Technology
240
000 - Computer science, information & general works
228
333 - Economics of land & energy
226
304 - Factors affecting social behavior
192
140 - Specific philosophical schools
186
363 - Other social problems & services
145
620 - Engineering & allied operations
140
370 - Education
134
320 - Political science
129
380 - Commerce, communications & transportation
120
300 - Social sciences
107
580 - Plants (Botany)
106
571 - Physiology & related subjects
104
100 - Philosophy & psychology
85
301 - Sociology & anthropology
83
612 - Human physiology
80
500 - Natural sciences & mathematics
79
361 - Social problems & social welfare in general
78
800 - Literature & rhetoric
70
340 - Law
69
820 - English & Old English literatures
67
200 - Religion
59
570 - Life sciences; biology
58
540 - Chemistry & allied sciences
44
004 - Data processing & computer science
43
576 - Genetics & evolution
42
414 - Phonology & phonetics
41
230 - Christianity & Christian theology
39
331 - Labor economics
37
618 - Gynecology, obstetrics, pediatrics & geriatrics
35
616 - Diseases
31
400 - Language
29
551 - Geology, hydrology & meteorology
29
410 - Linguistics
27
658 - General management
27
155 - Differential & developmental psychology
26
302 - Social interaction
25
630 - Agriculture & related technologies
25
170 - Ethics
23
530 - Physics
22
150 - Psychology
21
005 - Computer programming, programs & data
20
581 - Specific topics in natural history
20
615 - Pharmacology & therapeutics
20
more ...