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biography classifications major works cross references classifications search classifications for: Simpson, George Gaylord Palaeontologists, palaeobotanists, palaeoanthropologists, fossil geologists, fossil anthropologists Natural history personalities, biologists, naturalists, evolutionists, museum directors, geneticists, embryologists, microscopists, cytologists, taxonomists, photographers, natural history TV presenters (excludes those working only on humans) Evolutionists, palaeontologists United States of America browse by name A B C D E F G H I J K L M N O P Q R S T U V W X Y Z browse by year   2700 - 691 BC 690 - 531 BC 530 - 481 BC 480 - 391 BC 390 - 281 BC 280 - 131 BC 130 - 61 BC 60 BC - 29 AD 30 - 109 110 - 239 240 - 329 330 - 409 410 - 549 550 - 639 640 - 799 800 - 899 900 - 979 980 - 1039 1040 - 1099 1100 - 1139 1140 - 1179 1180 - 1219 1220 - 1249 1250 - 1279 1280 - 1319 1320 - 1349 1350 - 1379 1380 - 1549 1550 - 1649 1650 - 1659 1660 - 1749 1750 - 1789 1790 - 1819 1820 - 1839 1840 - 1859 1860 - 1869 1870 - 1879 1880 - 1889 1890 - 1899 1900 - 1909 1910 - 1919 1920 - 1929 1930 - 1939 1940 - 1949 1950 - 2005 No Birth Date