Classification
500 - Natural sciences & mathematics
333 - Economics of land & energy
17
000 - Computer science, information & general works
12
330 - Economics
11
580 - Plants (Botany)
11
600 - Technology
11
363 - Other social problems & services
10
576 - Genetics & evolution
10
581 - Specific topics in natural history
10
610 - Medicine & health
10
620 - Engineering & allied operations
10
380 - Commerce, communications & transportation
9
700 - The arts; fine & decorative arts
8
658 - General management
7
300 - Social sciences
6
551 - Geology, hydrology & meteorology
6
612 - Human physiology
6
140 - Specific philosophical schools
5
540 - Chemistry & allied sciences
5
100 - Philosophy & psychology
4
414 - Phonology & phonetics
4
302 - Social interaction
3
370 - Education
3
400 - Language
3
615 - Pharmacology & therapeutics
3
670 - Manufacturing
3
900 - History & geography
3
170 - Ethics
2
304 - Factors affecting social behavior
2
331 - Labor economics
2
340 - Law
2
381 - Commerce
2
520 - Astronomy & allied sciences
2
745 - Decorative arts
2
120 - Epistemology, causation & humankind
1
320 - Political science
1
384 - Communications; telecommunication
1
530 - Physics
1
572 - Biochemistry
1
800 - Literature & rhetoric
1