Map, 'Map of England and Wales showing supposed areas of the coal-measures as originally deposited' by Edward Hull and John Betts A printed map with annotations in pencil and ink by Hull. Areas of the map have been shaded grey, and various numbers have been written on the map in red ink. A caption reads 'The numbers show the original thickness of the coal-measures in feet.' The original map was produced by John Betts, 115, Strand [London]. Subject: Geology 1870