. . . . . "Census data"@en . . . . . . "Cook County, Illinois : 1850 federal census, not including the city of Chicago"@en . . . . . . . "Cook County, Illinois 1850 federal census, not including the city of Chicago : part 1, northern, eastern and western townships ; part 2, eight southern townships ; part 3, 1850 mortality schedule, entire county"@en . "Genealogy"@en . . "Cook County (Ill.)" . . . . "United States, Illinois, Cook" . . "1850" . . "United States" . .