Machines at Work by Mary Elting
Machines at Work
Machines at Work by Mary Elting
Publisher: Harvey House 1962
ISBN/ASIN: B0006AY0EG
Number of pages: 100
People have always been able to work and build wonderful things, using just their muscles. And they can do a very great deal more when they use their brains, too. They can invent machines to make work thousands of times easier and faster.
Children's Books Science & Technology
Publisher: Harvey House 1962
ISBN/ASIN: B0006AY0EG
Number of pages: 100
People have always been able to work and build wonderful things, using just their muscles. And they can do a very great deal more when they use their brains, too. They can invent machines to make work thousands of times easier and faster.
Children's Books Science & Technology
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