Map record details

Map series Geological Survey of England and Wales 1:63,360/1:50,000 geological map series, New Series 
Sheet number 239 
Sheet title Hertford. 
Map type Drift 
Scale 1:63 360 
Publication year 1968 
Author statement Original geological survey on the Old Series one-inch maps, published in 1861-1898. Re-surveyed on the six-inch scale by R.L. Sherlock, R.W. Pocock and T. Robertson in 1911-14 and 1921. 
Published statement Published (with Drift) 1924. Reprinted 1948. Reprinted (4th impression) 1968. Print code: 2000/68. 
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