Martha Schaefer (Schaefer, Martha)

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• 
  Worlds Apart: A Textbook in Planetary Sciences
  

  by Guy Consolmagno, Martha Schaefer

  ISBN 9780139641312 (978-0-13-964131-2)
  Softcover, Pearson, 1994

  
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• 
  The writing process, step by step
  

  by Martha Schaefer

  ISBN 9780876268735 (978-0-87626-873-5)
  Softcover, Winthrop Publishers, 1975

  
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