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TY - JOUR T1 - On Some Further Evidence Bearing on the Excavation of the Valley of the Somme by River-Action, as Exhibited in a Section at Drucat near Abbeville JF - Proceedings of the Royal Society of London (1854-1905) VL - 13 SP - 135 EP - 137 PY - 1863/01/01/ UR - http://dx.doi.org/10.1098/rspl.1863.0031 M3 - doi:10.1098/rspl.1863.0031 AU - Prestwich, J. ER -