The Geology of the N. W. Part of Essex and the N. E. Part of Herts. With Parts of Cambridgeshire and Suffolk. (Explanation of Sheet 47 of the Map (One-Inch) of the Geological Survey of England and Wales)

The Geology of the N. W. Part of Essex and the N. E. Part of Herts. With Parts of Cambridgeshire and Suffolk. (Explanation of Sheet 47 of the Map (One-Inch) of the Geological Survey of England and Wales)