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- The date given is the date used by Historic England as significant for the initial building or that of an important part in the structure's description.
- Sometimes known as OSGB36, the grid reference is based on the British national grid reference system used by the Ordnance Survey.
- The "List Entry Number" is a unique number assigned to each listed building and scheduled monument by Historic England.
Media related to Grade I listed buildings in Hertfordshire at Wikimedia Commons
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