Classification
620 - Engineering & allied operations
1,285
700 - The arts; fine & decorative arts
307
600 - Technology
304
547 - Organic chemistry
188
540 - Chemistry & allied sciences
173
000 - Computer science, information & general works
161
333 - Economics of land & energy
155
900 - History & geography
153
541 - Physical chemistry
130
660 - Chemical engineering
125
610 - Medicine & health
120
530 - Physics
113
668 - Technology of other organic products
76
363 - Other social problems & services
74
580 - Plants (Botany)
65
621 - Applied physics
64
546 - Inorganic chemistry
59
380 - Commerce, communications & transportation
55
414 - Phonology & phonetics
47
330 - Economics
40
615 - Pharmacology & therapeutics
38
543 - Analytical chemistry
37
140 - Specific philosophical schools
31
500 - Natural sciences & mathematics
25
576 - Genetics & evolution
25
572 - Biochemistry
21
670 - Manufacturing
19
628 - Sanitary & municipal engineering
17
667 - Cleaning, color & coating technologies
17
677 - Textiles
15
720 - Architecture
15
800 - Literature & rhetoric
14
304 - Factors affecting social behavior
12
630 - Agriculture & related technologies
12
664 - Food technology
12
340 - Law
11
571 - Physiology & related subjects
11
570 - Life sciences; biology
9
577 - Ecology
9
612 - Human physiology
9
661 - Industrial chemicals
9
531 - Classical mechanics; solid mechanics
8
551 - Geology, hydrology & meteorology
8
539 - Modern physics
7
629 - Other branches of engineering
6
658 - General management
6
536 - Heat
5
370 - Education
4
542 - Techniques, equipment & materials
4
641 - Food & drink
4
more ...