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Boomerang Ask.com Design, Throwing, Flight Path.

Yutaka Nishiyama, Instructions of Paper Boomerangs in 70 Languages , Flight of paper boomerang

Valde-Nowak et al. (1987). "Upper Palaeolithic boomerang made of a mammoth tusk in south Poland". Nature 329: 436-438 (1 October 1987); doi:10.1038/329436a0.