Ellen Thro
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Volcanoes of the United States (Venture Book)
Thro, Ellen
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Robotics: The Marriage of Computers and Machines (Facts on File Science Sourcebooks)
Thro, Ellen
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Robotics: Intelligent Machines for the New Century (Science and Technology in Focus)
Thro, Ellen
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Genetic Engineering: Shaping the Material of Life (Facts on File Science Sourcebooks)
Thro, Ellen
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Growing and Dividing (Making of America)
Thro, Ellen; Frank, Andrew K.
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Robotics Careers (High-Tech Careers)
Thro, Ellen
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Artificial Life: Explorer's Kit (Software Included)
Thro, Ellen
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Twentieth-Century Women Politicians (American Profiles)
Thro, Ellen
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