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19th century American ancient animals atomic became Bibliography bifaces called cause cells central Charles chemical chlorophyll Christian church color contain continental continental drift developed disease drug early elected electrons Europe film flowering plants flowers fossil France French Greek History Holy Roman Emperor human important Indian industry islands John king known land later light major ment modern motion mountain National North North America occur ocean organisms Pacific painting Pakistan Paleolithic Paleozoic Panama Paraguay Paris party Pennsylvania period permafrost Persian pesticides Peter Philip philosophical photographic photosynthesis physics Pius plankton plants plastics plate plate tectonics Plato Pleistocene poison Poland polarized Polish political pollen Pope population president produced region repr River rocks Roman Rome seafloor spreading South species structure surface temperature theory tion trans types United western William