National Data Book and Guide to Sources : Statistical Abstract of the United States 1986. 

 - 106 th. ed. 
 - Washington :  U.S. Department of Commerce,  1986. 
 - vi-xvi, 985 p. :   gráfs. ;  23 x 15 cm. 
<br/><br/><label>Source: </label>U4014  D. J. Bellina  General  Ej.: 1  Impreso 
<br/><br/><label>Subjects--Index Terms: </label>ESTADISTICAS PRIVADAS GOBIERNO EDUCACION NUTRICION COMUNICACION TRANSPORTES 
<br/><br/><label>Universal Decimal Class. No.: </label>378