Rating: 4 out of 5 stars
4/5
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author
D. J. Ward
D. J. Ward is a high school science teacher who also writes science books for children. His titles include Exploring Mars, Materials Science, and, in the Let's-Read-and-Find-Out Sc...view moreD. J. Ward is a high school science teacher who also writes science books for children. His titles include Exploring Mars, Materials Science, and, in the Let's-Read-and-Find-Out Science series, How a City Works and What Happens to Our Trash? He lives in Castle Rock, Colorado.view less
Books by D. J. Ward
Simple Machines How a City Works Rating: 4 out of 5 stars4/5What Happens to Our Trash? Rating: 4 out of 5 stars4/5