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Chicago-viite (17. p.)Census of Population and Housing, 1990 [United States] STF3A Record Sequence Example File / United States Department of Commerce. Bureau of the Census. [electronic Resource]. 1992.
MLA-viite (9. p.)Census of Population and Housing, 1990 [United States] STF3A Record Sequence Example File / United States Department of Commerce. Bureau of the Census. [electronic Resource]. 1992.
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