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- Cărți electroniceUnited States Census Figures Back to 1630United States. Bureau of the Census
- Cărți electroniceThe 1990 United States CensusUnited States. Bureau of the Census
- Cărți electroniceUnited States Census Figures Back to 1630United States. Bureau of the Census
- Cărți electroniceThe 1990 United States CensusUnited States. Bureau of the Census
- Cărți electroniceThe 1990 United States Census [2nd]United States. Bureau of the Census
- Cărți electroniceThe 1990 United States Census [2nd]United States. Bureau of the Census
- Cărți electroniceUnited States Census Figures Back to 1630United States. Bureau of the Census