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