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