Dataset: uscty3090.dat Source: U.S. Census Bureau Description: U.S. County Population (48 Contiguous States) by census for years 1930-1990. Variables/Columns: County 1-27 1930 Pop 29-36 1940 Pop 38-45 1950 Pop 47-54 1960 Pop 56-63 1970 Pop 65-72 1980 Pop 74-81 1990 Pop 83-90