000 - Computer science, information, general works 18,851 100 - Philosophy & psychology 9,541 200 - Religion 2,385 300 - Social sciences 61,155 400 - Language 4,683 500 - Natural sciences and mathematics 28,674 600 - Technology (Applied sciences) 75,248 700 - The arts 3,176 800 - Literature (Belles-lettres) and rhetoric 21,366 900 - History & geography 8,109