Classification
000 - Computer science, information & general works
333 - Economics of land & energy
4
610 - Medicine & health
4
140 - Specific philosophical schools
2
363 - Other social problems & services
2
600 - Technology
2
006 - Special computer methods
1
302 - Social interaction
1
331 - Labor economics
1
380 - Commerce, communications & transportation
1
381 - Commerce
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
700 - The arts; fine & decorative arts
1