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  Emotional Health

  $21.95 – $24.95Price range: $21.95 through $24.95
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  Encouraging Others

  $8.95 – $22.95Price range: $8.95 through $22.95
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  Endangered Life Cycles
  (Set of 4)
  

  $39.80 – $107.80Price range: $39.80 through $107.80
• Sale

  

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  Energy for the Future (Set of 6)

  $59.70 – $149.70Price range: $59.70 through $149.70
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  Energy from Algae

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Energy from the Earth

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Energy from the Sun

  $9.95 – $24.95Price range: $9.95 through $24.95
• Sale

  

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  Energy from Water

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Energy from Wind

  $9.95 – $24.95Price range: $9.95 through $24.95
• Sale

  

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  Energy Technology Inspired by Nature

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Engineering

  $9.95 – $26.95Price range: $9.95 through $26.95
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  Engineering Challenges
  (Set of 8)
  

  $79.60 – $199.60Price range: $79.60 through $199.60