581 - Specific topics in natural history 320 - Political science 1 330 - Economics 1 500 - Natural sciences & mathematics 1 551 - Geology, hydrology & meteorology 1 574 - [Unassigned] 1 580 - Plants (Botany) 1 630 - Agriculture & related technologies 1 700 - The arts; fine & decorative arts 1 900 - History & geography 1