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This close-up sketch of rocks descending to a gorge or river seems similar to the coloured study from this sketchbook, D04627; Turner Bequest LXXV 35. The location is perhaps by the River Reuss. For Turner’s visit to the St Gotthard Pass and Reuss gorge in 1802 see Introduction to the sketchbook and notes to D04628; Turner Bequest LXXV 36.
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Joseph Mallord William Turner, Thomas Girtin In the Pass of St Gotthard, Switzerland