Moving Heavy Things
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An introduction to simple machines and how they help to lift and move heavy objects.
An introduction to simple machines and how they help to lift and move heavy objects.
Originally published: Boston: Houghton Mifflin, 1978.
Describes the true living and working conditions of real cowboys in the old West.
While spending the day alone on an island near his Cape Cod home, a fifteen-year-old suddenly finds himself transported back in time where he is befriended by a