000 - Computer science, information, general works 18,861 100 - Philosophy & psychology 9,543 200 - Religion 2,386 300 - Social sciences 61,159 400 - Language 4,690 500 - Natural sciences and mathematics 28,670 600 - Technology (Applied sciences) 75,234 700 - The arts 3,185 800 - Literature (Belles-lettres) and rhetoric 21,411 900 - History & geography 8,121