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america usa us statistics census c18th c19th c20th 1920s 1930s 1940s 1950s 1960s 1970s population demographics
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britain uk england population london statistics sources primary images demography medicine documents
australia modern sources c20th statistics demography data society research adsri politics population
modern america usa sources documents primary c20th census population government politics michigan statistics
modern europe america usa canada indians native americans uk britain england sources documents primary c20th c19th census population archives records