Classification
305 - Social groups
807
330 - Economics
635
610 - Medicine & health
617
306 - Culture & institutions
526
900 - History & geography
491
700 - The arts; fine & decorative arts
414
600 - Technology
242
000 - Computer science, information & general works
231
333 - Economics of land & energy
230
304 - Factors affecting social behavior
201
140 - Specific philosophical schools
187
363 - Other social problems & services
145
620 - Engineering & allied operations
144
320 - Political science
139
370 - Education
139
380 - Commerce, communications & transportation
124
300 - Social sciences
118
580 - Plants (Botany)
106
571 - Physiology & related subjects
105
301 - Sociology & anthropology
97
100 - Philosophy & psychology
91
361 - Social problems & social welfare in general
88
800 - Literature & rhetoric
85
500 - Natural sciences & mathematics
79
612 - Human physiology
78
340 - Law
77
200 - Religion
70
820 - English & Old English literatures
67
570 - Life sciences; biology
60
540 - Chemistry & allied sciences
54
004 - Data processing & computer science
45
576 - Genetics & evolution
42
400 - Language
41
414 - Phonology & phonetics
41
230 - Christianity & Christian theology
39
410 - Linguistics
36
618 - Gynecology, obstetrics, pediatrics & geriatrics
35
331 - Labor economics
33
616 - Diseases
32
551 - Geology, hydrology & meteorology
29
155 - Differential & developmental psychology
27
658 - General management
27
302 - Social interaction
26
630 - Agriculture & related technologies
25
150 - Psychology
23
170 - Ethics
23
581 - Specific topics in natural history
23
720 - Architecture
23
780 - Music
22
530 - Physics
21
more ...