000 - Computer science, information, general works 709 100 - Philosophy & psychology 179 200 - Religion 61 300 - Social sciences 6 505 400 - Language 160 500 - Natural sciences and mathematics 419 600 - Technology (Applied sciences) 3 973 700 - The arts 22 800 - Literature (Belles-lettres) and rhetoric 154 900 - History & geography 37