Statistical abstract of the United States, 1981 / 
U.S. Department of Commerce, Bureau of the Census. 
 - 16th ed. 
 - Washington:   Government. Printing Office,   1981.  
 - 1039 p. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Political History--Government<br/>Geography<br/>Economic development<br/>Social problems<br/>Education--Social aspects<br/>Administration--Law--History
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States
<br/><br/><label>Dewey Class. No.: </label>973