Classification
620 - Engineering & allied operations
1,345
600 - Technology
311
700 - The arts; fine & decorative arts
309
547 - Organic chemistry
190
000 - Computer science, information & general works
161
333 - Economics of land & energy
155
900 - History & geography
154
540 - Chemistry & allied sciences
153
541 - Physical chemistry
139
660 - Chemical engineering
125
610 - Medicine & health
119
530 - Physics
114
668 - Technology of other organic products
76
363 - Other social problems & services
73
580 - Plants (Botany)
65
621 - Applied physics
64
546 - Inorganic chemistry
60
380 - Commerce, communications & transportation
55
414 - Phonology & phonetics
47
330 - Economics
40
615 - Pharmacology & therapeutics
39
543 - Analytical chemistry
38
140 - Specific philosophical schools
31
670 - Manufacturing
31
500 - Natural sciences & mathematics
25
576 - Genetics & evolution
25
572 - Biochemistry
21
628 - Sanitary & municipal engineering
17
667 - Cleaning, color & coating technologies
17
677 - Textiles
15
720 - Architecture
15
800 - Literature & rhetoric
14
664 - Food technology
13
304 - Factors affecting social behavior
12
577 - Ecology
12
340 - Law
11
571 - Physiology & related subjects
11
630 - Agriculture & related technologies
11
570 - Life sciences; biology
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
641 - Food & drink
5
370 - Education
4
542 - Techniques, equipment & materials
4
more ...