M. Ycas (Ycas, M.)

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• 
  Biological Code (Frontiers of Biology)
  

  by M. Ycas

  ISBN 9780720471120 (978-0-7204-7112-0)
  Hardcover, North-Holland Pub. Co., 1969

  
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• 
  Mr. Tompkins Insi
  

  by George Gamow, M. Ycas

  ISBN 9780670494156 (978-0-670-49415-6)
  Hardcover, Viking Adult, 1967

  
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