What is a wedge?

Illustrations and text describe different examples of the use of simple machines known as wedges.

9780329322090
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370

Holdings

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241214959387562413678451510045PYE374PYE0020255621.8 DOU621.816377825731736800991
32744696680164157667845151004534152T 4317496621.8 DOU621.816407292551640729255