Billerica Public Library
Helmer, Der-shing
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Helmer, Der-shing
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Helmer, Der-shing
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Conduct a science experiment!, written by Der-shing Helmer ; art by Andrea Bell
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Conduct a science experiment!, written by Der-shing Helmer ; art by Andrea Bell
Author of
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Conduct a science experiment!, written by Der-shing Helmer ; art by Andrea Bell
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