Classification
621 - Applied physics
768
333 - Economics of land & energy
154
338 - Production
121
620 - Engineering & allied operations
78
660 - Chemical engineering
47
658 - General management
35
541 - Physical chemistry
31
629 - Other branches of engineering
25
624 - Civil engineering
19
363 - Other social problems & services
18
577 - Ecology
18
720 - Architecture
16
579 - Microorganisms, fungi & algae
14
600 - Technology
13
531 - Classical mechanics; solid mechanics
11
551 - Geology, hydrology & meteorology
11
628 - Sanitary & municipal engineering
11
388 - Transportation; ground transportation
10
700 - The arts; fine & decorative arts
10
006 - Special computer methods
9
330 - Economics
8
670 - Manufacturing
8
690 - Buildings
8
519 - Probabilities & applied mathematics
7
530 - Physics
6
580 - Plants (Botany)
6
000 - Computer science, information & general works
5
380 - Commerce, communications & transportation
5
630 - Agriculture & related technologies
5
900 - History & geography
5
004 - Data processing & computer science
4
005 - Computer programming, programs & data
4
320 - Political science
4
532 - Fluid mechanics; liquid mechanics
4
533 - Gas mechanics
4
539 - Modern physics
4
550 - Earth sciences
4
553 - Economic geology
4
634 - Orchards, fruits & forestry
4
174 - Occupational ethics
3
570 - Life sciences; biology
3
572 - Biochemistry
3
610 - Medicine & health
3
631 - Techniques, equipment & materials
3
650 - Management & auxiliary services
3
710 - Civic & landscape art
3
003 - Systems
2
307 - Communities
2
340 - Law
2
500 - Natural sciences & mathematics
2
more ...