000 - Computer science, information, general works 25,763 100 - Philosophy & psychology 18,319 200 - Religion 42,242 300 - Social sciences 128,549 400 - Language 26,163 500 - Natural sciences and mathematics 44,646 600 - Technology (Applied sciences) 45,623 700 - The arts 22,218 800 - Literature (Belles-lettres) and rhetoric 210,012 900 - History & geography 41,487