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Book, 1989
Current format, Book, 1989, , Available .
Book, 1989
Current format, Book, 1989, , Available . Offered in 0 more formats
The marvels of technology are part of a child's everyday world. Here, in simple language with clear illustrations, are answers to the difficult questions children often ask about how things work-- from vacuum cleaners and cameras to magnifying glasses and tape recorders.
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