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Invasion of the barley... www.theguardian.com

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Crop circle - Wikipedia en.wikipedia.org

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Mysterious Calif. crop... www.nbcnews.com

Crop Circle Exhibition &... www.greatwestway.co.uk

Fields of dreams: who... www.thetimes.co.uk

Confessions of a crop... www.bostonglobe.com

Video Mysterious Crop... abcnews.go.com

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Crop circles demystified:... www.telegraph.co.uk

Crop circles: MIT's most... news.mit.edu

What Do We Know about Crop... www.amazon.com.br

Crop circles: They're real... www.nzherald.co.nz

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