The Secret of Planetoid 88

• 42891939-7162523051_a502984e12_o[1]

  https://pulpcovers.com/wp-content/uploads/2012/07/42891939-7162523051_a502984e12_o1.jpg

  Back cover by Frank R. Paul illustrates Serenis, Water City of Callisto via

  

• Serenis, Water City of Callisto

  https://pulpcovers.com/wp-content/uploads/2012/07/Serenis-Water-City-of-Callisto.jpg

  Back cover by Frank R. Paul illustrates Serenis, Water City of Callisto via

  

Back cover by Frank R. Paul illustrates Serenis, Water City of Callisto

via