000 - Computer science, information, general works 18,900 100 - Philosophy & psychology 9,545 200 - Religion 2,386 300 - Social sciences 61,182 400 - Language 4,691 500 - Natural sciences and mathematics 28,672 600 - Technology (Applied sciences) 75,396 700 - The arts 3,187 800 - Literature (Belles-lettres) and rhetoric 21,449 900 - History & geography 8,123