|aStatistical abstract of the United States, 1997 :|bthe national data book.
250
|a117th ed.
260
|aWashington, D.C. :|bU.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census :|bFor sale by the Supt. of Docs., U.S. G.P.O.,|c1997.
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