Source: |
The sand and gravel resources of the country around Hemel Hempstead, St Albans and Watford, Hertfordshire : description of 1:25 000 sheets TL 00, TL 10 and parts of TQ 09 and TQ 19
[0-11-884171-8]
Harries,
W. J. R.
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yr:1982
pg:III
-84S.+1Kt.-Beil.
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