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Ancient and Historical Monuments in the County of Gloucester
… more or less circular plans, sometimes interrupted by causeways) appear as crop-marks in many air photographs; they …
An Inventory of the Historical Monuments in the County of Cambridgeshire
… in at least five places there are what appear to be low causeways up to 30 yds. wide crossing it at right angles. … footpath; the ditch was also completely filled by narrow causeways. All four gaps were cut to take tracks across …