1.
Photon U: 50 Hands-On Experiments That Explore the World of Light, Color, and Perception
by Wallie Winholtz, Kathy Cram...
ISBN: 9780966096552
List Price: $14.95
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Sixty-One Cooperative Learning Activities for Science Classes
by Cramer, Kathy, Winholtz, Wa...
ISBN: 9780825137679
List Price: $24.99