File X (11)
By:  
		August 20, 2010		
		
		
In response to the demands of HiLobrow, Boing Boing and io9 readers, here’s the eleventh in what is now a series of twenty posts showcasing my collection of midcentury paperbacks the titles of which include an “X.”

NB: Sometimes mistakenly referred to as Perry Rhodan: Secret Barrier X-16.
