Perhaps the Museum of Modern Art?
_http://www.flickr.com/photos/wallyg/562286070/_ 
(http://www.flickr.com/photos/wallyg/562286070/) 
Found by a web search using the terms
Andy Warhol  double Elvis Presley silkscreen
 
There are other hits as well.
Barbara Hass, retired librarian
 
 
 
In a message dated 6/5/2009 5:40:16 P.M. Mountain Daylight Time,  
[log in to unmask] writes:

Please excuse cross  posting. 
For an exhibition next January,  the National Portrait Gallery is hoping to 
borrow a Ferus type  silkscreen by Andy Warhol of  Elvis Presley.  It must  
be smaller than 82 inches wide to fit the particular gallery for the  
exhibition so a double or small triple portrait would be ideal.    


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