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Wyllie, Duncan C.. (2015). Rock Fall Engineering . New York: CRC Press.

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Wyllie, Duncan C.. Rock Fall Engineering. New York: CRC Press, 2015. Text.

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Wyllie, Duncan C.. Rock Fall Engineering. New York: CRC Press, 2015. Text.

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Wyllie, Duncan C.. Rock Fall Engineering. New York: CRC Press, 2015. Print.