For your consideration, here is the Ace Double Science Fiction Paperback Book, It has wear on the covers and tanning of the pages.  It will be mailed in a box for protection.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (421.331t-.9bb1)

*  The Rim of Space by A. Bertram Chandler, no. F-133, copyright 1962, 138 pages

*  Secret Agent of Terra by John Brunner, no. F-135, copyright 1961, 127 pages