Classification
621 - Applied physics
152
333 - Economics of land & energy
81
338 - Production
66
620 - Engineering & allied operations
44
660 - Chemical engineering
25
658 - General management
15
600 - Technology
13
629 - Other branches of engineering
12
624 - Civil engineering
11
700 - The arts; fine & decorative arts
11
720 - Architecture
10
330 - Economics
8
363 - Other social problems & services
7
579 - Microorganisms, fungi & algae
6
000 - Computer science, information & general works
5
380 - Commerce, communications & transportation
5
690 - Buildings
5
900 - History & geography
5
519 - Probabilities & applied mathematics
4
531 - Classical mechanics; solid mechanics
4
541 - Physical chemistry
4
551 - Geology, hydrology & meteorology
4
580 - Plants (Botany)
4
628 - Sanitary & municipal engineering
4
670 - Manufacturing
4
174 - Occupational ethics
3
577 - Ecology
3
630 - Agriculture & related technologies
3
004 - Data processing & computer science
2
140 - Specific philosophical schools
2
320 - Political science
2
536 - Heat
2
546 - Inorganic chemistry
2
553 - Economic geology
2
570 - Life sciences; biology
2
627 - Hydraulic engineering
2
650 - Management & auxiliary services
2
710 - Civic & landscape art
2
005 - Computer programming, programs & data
1
006 - Special computer methods
1
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
340 - Law
1
361 - Social problems & social welfare in general
1
388 - Transportation; ground transportation
1
400 - Language
1
500 - Natural sciences & mathematics
1
526 - Mathematical geography
1
530 - Physics
1
more ...