Classification
330 - Economics
1,397
630 - Agriculture & related technologies
1,152
664 - Food technology
1,115
641 - Food & drink
950
540 - Chemistry & allied sciences
816
610 - Medicine & health
618
320 - Political science
525
363 - Other social problems & services
494
333 - Economics of land & energy
444
000 - Computer science, information & general works
398
600 - Technology
359
700 - The arts; fine & decorative arts
320
580 - Plants (Botany)
260
620 - Engineering & allied operations
250
380 - Commerce, communications & transportation
200
140 - Specific philosophical schools
160
900 - History & geography
139
340 - Law
119
300 - Social sciences
114
551 - Geology, hydrology & meteorology
110
576 - Genetics & evolution
107
572 - Biochemistry
98
615 - Pharmacology & therapeutics
97
660 - Chemical engineering
96
543 - Analytical chemistry
91
304 - Factors affecting social behavior
90
581 - Specific topics in natural history
81
570 - Life sciences; biology
78
658 - General management
73
613 - Personal health & safety
71
370 - Education
69
338 - Production
67
500 - Natural sciences & mathematics
65
579 - Microorganisms, fungi & algae
62
577 - Ecology
58
612 - Human physiology
53
547 - Organic chemistry
50
571 - Physiology & related subjects
42
616 - Diseases
40
301 - Sociology & anthropology
39
800 - Literature & rhetoric
37
100 - Philosophy & psychology
35
541 - Physical chemistry
33
530 - Physics
32
546 - Inorganic chemistry
25
414 - Phonology & phonetics
24
621 - Applied physics
22
361 - Social problems & social welfare in general
21
628 - Sanitary & municipal engineering
21
670 - Manufacturing
20
more ...