Classification
610 - Medicine & health
304 - Factors affecting social behavior
1,871
330 - Economics
1,642
700 - The arts; fine & decorative arts
1,415
333 - Economics of land & energy
928
600 - Technology
801
000 - Computer science, information & general works
779
363 - Other social problems & services
710
140 - Specific philosophical schools
707
320 - Political science
559
580 - Plants (Botany)
525
380 - Commerce, communications & transportation
510
370 - Education
501
900 - History & geography
477
620 - Engineering & allied operations
454
100 - Philosophy & psychology
321
612 - Human physiology
274
500 - Natural sciences & mathematics
272
540 - Chemistry & allied sciences
222
576 - Genetics & evolution
196
306 - Culture & institutions
189
615 - Pharmacology & therapeutics
179
630 - Agriculture & related technologies
159
170 - Ethics
147
300 - Social sciences
130
340 - Law
127
551 - Geology, hydrology & meteorology
118
658 - General management
108
581 - Specific topics in natural history
94
361 - Social problems & social welfare in general
89
800 - Literature & rhetoric
81
414 - Phonology & phonetics
64
301 - Sociology & anthropology
61
200 - Religion
58
400 - Language
56
362 - Social welfare problems & services
53
720 - Architecture
48
616 - Diseases
46
530 - Physics
40
780 - Music
24
410 - Linguistics
22
174 - Occupational ethics
20
336 - Public finance
20
374 - Adult education
19
791 - Public performances
16
519 - Probabilities & applied mathematics
13
384 - Communications; telecommunication
12
590 - Animals (Zoology)
12
614 - Incidence & prevention of disease
11
618 - Gynecology, obstetrics, pediatrics & geriatrics
11
more ...