Classification
000 - Computer science, information & general works
170 - Ethics
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
140 - Specific philosophical schools
1
200 - Religion
1
300 - Social sciences
1
320 - Political science
1
340 - Law
1
361 - Social problems & social welfare in general
1
370 - Education
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
900 - History & geography
1