Classification
333 - Economics of land & energy
43
330 - Economics
19
363 - Other social problems & services
16
000 - Computer science, information & general works
9
600 - Technology
9
700 - The arts; fine & decorative arts
7
338 - Production
6
620 - Engineering & allied operations
6
320 - Political science
5
380 - Commerce, communications & transportation
5
621 - Applied physics
5
900 - History & geography
5
580 - Plants (Botany)
4
140 - Specific philosophical schools
3
340 - Law
3
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
100 - Philosophy & psychology
1
361 - Social problems & social welfare in general
1
381 - Commerce
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
553 - Economic geology
1
577 - Ecology
1
628 - Sanitary & municipal engineering
1
658 - General management
1
676 - Pulp & paper technology
1
800 - Literature & rhetoric
1