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From David Forbes   18 February 1871

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Thanks for copy of Descent.

Author:  David Forbes
Addressee:  Charles Robert Darwin
Date:  18 Feb 1871
Classmark:  DAR 164: 146
Letter no:  DCP-LETT-7487

To David Forbes   18 November [1871]

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Inquires about the effect of turf covering on the rate of disintegration of rock.

Author:  Charles Robert Darwin
Addressee:  David Forbes
Date:  18 Nov [1871]
Classmark:  DAR 185: 111
Letter no:  DCP-LETT-8075

From David Forbes   22 November [1871]

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Effect of turf covering on the disintegration of rocks. Weathering of rock; relative importance of different agents with different rocks.

Author:  David Forbes
Addressee:  Charles Robert Darwin
Date:  22 Nov [1871]
Classmark:  DAR 164: 148
Letter no:  DCP-LETT-8081
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