Classification
571 - Physiology & related subjects
2,842
610 - Medicine & health
2,120
616 - Diseases
1,773
570 - Life sciences; biology
1,361
000 - Computer science, information & general works
1,016
333 - Economics of land & energy
762
576 - Genetics & evolution
752
572 - Biochemistry
725
580 - Plants (Botany)
621
577 - Ecology
584
612 - Human physiology
584
700 - The arts; fine & decorative arts
548
620 - Engineering & allied operations
410
615 - Pharmacology & therapeutics
373
600 - Technology
352
006 - Special computer methods
345
363 - Other social problems & services
340
630 - Agriculture & related technologies
314
140 - Specific philosophical schools
251
660 - Chemical engineering
245
581 - Specific topics in natural history
244
579 - Microorganisms, fungi & algae
230
500 - Natural sciences & mathematics
220
540 - Chemistry & allied sciences
217
551 - Geology, hydrology & meteorology
215
380 - Commerce, communications & transportation
178
330 - Economics
169
003 - Systems
166
590 - Animals (Zoology)
164
900 - History & geography
125
519 - Probabilities & applied mathematics
120
304 - Factors affecting social behavior
113
530 - Physics
101
910 - Geography & travel
95
040 - [Unassigned]
84
611 - Human anatomy, cytology & histology
83
591 - Specific topics in natural history
77
005 - Computer programming, programs & data
74
614 - Incidence & prevention of disease
74
414 - Phonology & phonetics
72
592 - Invertebrates
72
061 - Organizations in North America
70
550 - Earth sciences
67
515 - Analysis
66
543 - Analytical chemistry
65
617 - Surgery & related medical specialties
64
547 - Organic chemistry
62
634 - Orchards, fruits & forestry
62
004 - Data processing & computer science
61
658 - General management
58
more ...