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Journal Articles
Journal Articles
Journal Articles
Journal Articles
Minutes of the Proceedings of the Institution of Civil Engineers (1850) 9 (1850): 360–368.
Published: 31 December 1850
... the upper greensand ; and then on a bed of tough clay, generally knownas the gault,very imperme- able to water, and very persistent, wherever the base of the chalk series hbaesen reached. Thueppgereensanrdeceiveitss name from the frequent presence of minute particles of silicate Qf iron, and often passes...

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