000 - Computer science, information & general works 320 - Political science 330 - Economics 380 - Commerce, communications & transportation 600 - Technology 3 100 - Philosophy & psychology 2 140 - Specific philosophical schools 2 170 - Ethics 2 363 - Other social problems & services 2 658 - General management 2 300 - Social sciences 1 340 - Law 1 361 - Social problems & social welfare in general 1 610 - Medicine & health 1 650 - Management & auxiliary services 1 657 - Accounting 1