Bob Ritter

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• 
  Science IV Essential Interactions Teachers Guide 1
  

  by Jim Dawson, Bob Ritter

  ISBN 9781930799295 (978-1-930799-29-5)
  Softcover, Centre Pointe Learning, 2001

  
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• 
  Soil and plant ecology
  

  by Bob Ritter

  ISBN 9780176057794 (978-0-17-605779-4)
  Softcover, ITP Nelson

  
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