Statistical abstract of the United States. 

 - 119th eg. 
 - Washington, D.C. :  U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, Data User Services Division,  1999. 
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<br/><br/><label>ISBN: </label>1573110604 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--Statistics--Periodicals.