Academic American encyclopedia, Volume 15

19th century American ancient animals atomic became Bibliography called carbon cause cells central Charles chemical Christian church color contains continental continental drift culture developed disease drug early elected electrons Europe film flowering plants flowers fossil France French Greek History Holy Roman Emperor human important Indian industry islands king known land later light major ment Middle Paleolithic modern motion mountain National North North America occur ocean organisms Pacific painting Pakistan Panama Paraguay Paris party Pennsylvania period permafrost Persian Peter Philip Philippines philosophy 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 rock Roman seafloor spreading South species structure surface temperature theory tion trans United Upper Paleolithic usually western William