Propagation and Attenuation of Lg Waves in South America. 

 - s.l. :   Scinetific Report,   1987. 
 - 32 p. :   il. ;   28 cm. 
 - Scientific Report ;   1 .
<br/><br/> Fotocopia.  Encuadernado. 
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<br/><br/><label>Dewey Class. No.: </label>526