Rubens, Alma. <br/><br/>
Penumbra   : (poemas) /  
Alma Rubens. 
 - San Juan de Puerto rico :   [s.n.],   1969 ( 
 - 69 p. :   il. ;   25 cm. 
<br/><br/><label>Universal Decimal Class. No.: </label>86.0(729.5)-14"19"