100 - Philosophy & psychology 170 - Ethics 1 200 - Religion 1 300 - Social sciences 320 - Political science 330 - Economics 360 - Social problems & services; associations 361 - Social problems & social welfare in general 1 370 - Education 1 380 - Commerce, communications & transportation 1 610 - Medicine & health 658 - General management 780 - Music 1 900 - History & geography