000 - Computer science, information, general works 20,933 100 - Philosophy & psychology 10,473 200 - Religion 2,574 300 - Social sciences 68,733 400 - Language 6,241 500 - Natural sciences and mathematics 32,762 600 - Technology (Applied sciences) 81,319 700 - The arts 4,355 800 - Literature (Belles-lettres) and rhetoric 32,039 900 - History & geography 9,430