These four Ace double science fiction books include novels from such writers as Gordon R Dickson, Andre Norton, George O Smith and John Brunner.  They were part of the important sci-fi writers of the post war era.  They are part of my extensive collection that I have begun to sell since I am getting a little long in the tooth. The price was set taking into account the age and condition of the books.

Please review the condition statement above and review the attached pictures to make your own determination of condition, since book conditions are somewhat subjective.  Payment is handled by EBay.    If you purchase more than one of my listings at the same time, I will combine the postage to save you money on shipping.  We do not accept returns, but the transaction is covered by EBay's protection plan.