000 - Computer science, information, general works 4.416 100 - Philosophy & psychology 8.736 200 - Religion 13.462 300 - Social sciences 63.319 400 - Language 4.979 500 - Natural sciences and mathematics 8.214 600 - Technology (Applied sciences) 12.276 700 - The arts 13.679 800 - Literature (Belles-lettres) and rhetoric 23.017 900 - History & geography 22.770