Edinburgh & LondonWilliam Blackwood & Sons, 1856. Original double page hand-coloured steel engraved map ( 51 x 61 cm, sheet 55 x 68 cm. ) with insets of (i) Elie de Beaumont's Directions of the Systems of Mountains as the appear at Milford, (ii) Twin Hemispheres North and South (iii) Illustrations of the Synchronism of Parallel Chains and (iv) The Principal Mountains of the Globe.with elevations.