Group of four Flash Gordon prose novels, 1980, Ace Tempo. covers by Boris Vallejo. All in solid readable condition, a little damage at the top center of the cover of book one, tiny corner off book four.

Book One: Massacre in the 22nd Century
Book Two: War of the Citadels
Book three: Crisis on Citadel II
Book four: forces From the Federation

One price gets the full set of four!