Classification
580 - Plants (Botany)
20
000 - Computer science, information & general works
19
581 - Specific topics in natural history
18
333 - Economics of land & energy
17
576 - Genetics & evolution
16
363 - Other social problems & services
15
610 - Medicine & health
13
500 - Natural sciences & mathematics
12
551 - Geology, hydrology & meteorology
12
700 - The arts; fine & decorative arts
12
380 - Commerce, communications & transportation
10
330 - Economics
9
620 - Engineering & allied operations
9
600 - Technology
8
140 - Specific philosophical schools
7
630 - Agriculture & related technologies
6
414 - Phonology & phonetics
5
540 - Chemistry & allied sciences
5
300 - Social sciences
4
570 - Life sciences; biology
4
612 - Human physiology
4
900 - History & geography
4
100 - Philosophy & psychology
2
320 - Political science
2
370 - Education
2
170 - Ethics
1
340 - Law
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
571 - Physiology & related subjects
1
632 - Plant injuries, diseases & pests
1
657 - Accounting
1
658 - General management
1
674 - Lumber processing, wood products & cork
1
720 - Architecture
1
800 - Literature & rhetoric
1