Classification
610 - Medicine & health
612 - Human physiology
900 - History & geography
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
600 - Technology
3
620 - Engineering & allied operations
3
380 - Commerce, communications & transportation
2
580 - Plants (Botany)
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
361 - Social problems & social welfare in general
1
370 - Education
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1