Classification
630 - Agriculture & related technologies
1,131
664 - Food technology
1,088
330 - Economics
958
641 - Food & drink
932
540 - Chemistry & allied sciences
848
610 - Medicine & health
613
320 - Political science
514
363 - Other social problems & services
481
333 - Economics of land & energy
434
000 - Computer science, information & general works
396
600 - Technology
346
700 - The arts; fine & decorative arts
309
580 - Plants (Botany)
264
620 - Engineering & allied operations
242
380 - Commerce, communications & transportation
197
140 - Specific philosophical schools
157
900 - History & geography
132
340 - Law
114
300 - Social sciences
111
572 - Biochemistry
109
576 - Genetics & evolution
108
615 - Pharmacology & therapeutics
102
551 - Geology, hydrology & meteorology
101
660 - Chemical engineering
98
543 - Analytical chemistry
89
570 - Life sciences; biology
88
304 - Factors affecting social behavior
84
581 - Specific topics in natural history
75
658 - General management
70
370 - Education
68
500 - Natural sciences & mathematics
67
613 - Personal health & safety
66
338 - Production
63
579 - Microorganisms, fungi & algae
59
577 - Ecology
58
612 - Human physiology
53
547 - Organic chemistry
52
616 - Diseases
42
571 - Physiology & related subjects
40
541 - Physical chemistry
38
301 - Sociology & anthropology
34
530 - Physics
33
800 - Literature & rhetoric
33
546 - Inorganic chemistry
29
100 - Philosophy & psychology
28
414 - Phonology & phonetics
24
621 - Applied physics
23
670 - Manufacturing
22
361 - Social problems & social welfare in general
21
628 - Sanitary & municipal engineering
21
more ...