Tunnels

Tunnels

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The 21st Century Junior Library Extraordinary Engineering series explains how important feats of engineering are accomplished. Tunnels examines the engineering concepts that make these important structures possible. Sidebars encourage readers...
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Ages: 8-10
Read time: 15-30 mins
AR LEVEL: 3.0
LEXILE©: 470L
Ages: 8-10
Read time: 15-30 mins

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