Classification
600 - Technology
2
620 - Engineering & allied operations
2
900 - History & geography
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
330 - Economics
1
333 - Economics of land & energy
1
370 - Education
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
580 - Plants (Botany)
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1