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The 1990 United States Census
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The 1990 United States Census [2nd]
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The 1991 CIA World Factbook
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The 1992 CIA World Factbook
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The 1993 CIA World Factbook
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The 1994 CIA World Factbook
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The 1995 CIA World Factbook
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The 1996 CIA World Factbook
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The 1997 CIA World Factbook
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The 1998 CIA World Factbook
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