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Olliff, J. L.. (1982). Factors of Safety in the Structural Design of Large Sewers . London: Pitman Advanced Publishing.

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Olliff, J. L.. Factors of Safety in the Structural Design of Large Sewers. London: Pitman Advanced Publishing, 1982. Text.

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Olliff, J. L.. Factors of Safety in the Structural Design of Large Sewers. London: Pitman Advanced Publishing, 1982. Text.

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Olliff, J. L.. Factors of Safety in the Structural Design of Large Sewers. London: Pitman Advanced Publishing, 1982. Print.