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earth population in 1200
earth population in 1500
earth population in 1300
earth population in 2000
earth population in 2008
earth population in 2002
earth population in 2004
earth population in 2006
population of earth in 1200 ad
earth population in 1200, earth population in 1500, earth population in 1300, earth population in 2000, earth population in 2008, earth population in 2002, earth population in 2004, earth population in 2006, population of earth in 1200 ad
