An Inventory of the Historical Monuments in Buckinghamshire, Volume 1, South. Originally published by His Majesty's Stationery Office, London, 1912.
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41. GERRARDS CROSS.
The work is roughly oval in shape, and encloses approximately 22 acres. The defences consist of an inner and outer rampart and ditch, except on the W. and N.W. sides where the outer ditch is obliterated. Of a flint wall added on the inner rampart on the N.W. the foundations remain; in the middle of the E. side of the camp and on the S. and N.E. sides are gaps, some of which may be original entrances.
Dimensions—Inner rampart 8½ ft. to 12 ft. high, 42½ ft. to 50½ ft. wide. Outer rampart 4½ ft. to 6 ft. high, 27½ ft. to 44 ft. wide. Inner ditch 4½ ft. to 6 ft. deep and 42 to 51½ ft. wide. Outer ditch 1 ft. to 2½ ft. deep and 24 to 37½ ft. wide.