How do helicopters work?

Simple text and photographs describe how helicopters work.

Lerner Publications
2013
9780761389668
book
Lexile: 
470

Holdings

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84351645756672328210350310458PIPR387PIPR68860629.133 BOO629.1315798937721736518457
200214355835572454210350310458GRLR242GRLR028046387.7 BOO387.715825759371742569409