Ipswich Public Library
621.31
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http://bibfra.me/vocab/lite/Category
Label
621.31
Code
621.31
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ddc
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Hydropower, by Diane Bailey
Wind, Walt Disney Productions in association with the National Science Foundation, WCET TV Seattle, and Rabbit Ears Productions ; James McKenna, Erren Gottlieb, executive producers
How to use wind power to light and heat your home, Claire O'Neal
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