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Credit
On the age, formation, and successive drift-stages of the valley of the Darent : with remarks on the Palaeolithic implements of the district, and on the origin of its chalk escarpment / by Joseph Prestwich. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.