You're buying the April 1971 issue of Analog Science Fiction.  Cover by Kelly Freas.  Condition is very good, solid and complete.

Table of contents:
   The Unreachable Stars • novelette by Stanley Schmidt
   Real Science for Real Problems • Science Fact essay by John R. Pierce
   Heart's Desire and Other Simple Wants • [Ravenshaw] • novelette by W. Macfarlane
   The World Menders (Part 3 of 3) • serial by Lloyd Biggle, Jr.
   Higher Centers • [LaNague Federation] • by F. Paul Wilson
       

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