Classification
330 - Economics
34
576 - Genetics & evolution
34
620 - Engineering & allied operations
18
301 - Sociology & anthropology
17
333 - Economics of land & energy
16
610 - Medicine & health
16
300 - Social sciences
14
572 - Biochemistry
14
616 - Diseases
13
900 - History & geography
13
570 - Life sciences; biology
12
571 - Physiology & related subjects
12
306 - Culture & institutions
11
547 - Organic chemistry
11
700 - The arts; fine & decorative arts
11
320 - Political science
10
612 - Human physiology
10
658 - General management
10
541 - Physical chemistry
9
520 - Astronomy & allied sciences
8
600 - Technology
8
621 - Applied physics
8
006 - Special computer methods
7
599 - Mammals
7
000 - Computer science, information & general works
6
142 - Critical philosophy
6
580 - Plants (Botany)
6
930 - History of ancient world to ca. 499
6
100 - Philosophy & psychology
5
302 - Social interaction
5
305 - Social groups
5
370 - Education
5
500 - Natural sciences & mathematics
5
590 - Animals (Zoology)
5
004 - Data processing & computer science
4
140 - Specific philosophical schools
4
150 - Psychology
4
155 - Differential & developmental psychology
4
174 - Occupational ethics
4
200 - Religion
4
304 - Factors affecting social behavior
4
338 - Production
4
340 - Law
4
380 - Commerce, communications & transportation
4
501 - Philosophy & theory
4
514 - Topology
4
530 - Physics
4
550 - Earth sciences
4
551 - Geology, hydrology & meteorology
4
577 - Ecology
4
more ...