The gorge of Pfeffers (showing erosive action), Gorge near Pfäfers, Signed: Whymper (sc.), Wood engraving, plate 7, integrated before p. 219, Whymper, Edward (sc.), 1871, John Tyndall, Hours of exercise in the Alps. London: Longmans, Greens and Co., 1871

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The gorge of Pfeffers (showing erosive action), Gorge near Pfäfers, Signed: Whymper (sc.), Wood engraving, plate 7, integrated before p. 219, Whymper, Edward (sc.), 1871, John Tyndall, Hours of exercise in the Alps. London: Longmans, Greens and Co., 1871

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Keywords: ., 7, 219, 1871, action, alps, edward, engraving, erosive, exercise, gorge, greens, hours, integrated, john, london, longmans, pfeffers, pfäfers, plate, sc., showing, signed, tyndall, whymper, wood