MAP OF FRANCE - RARE "Typo-geographical map invented and printed by FIRMIN-DIDOT". Paris, 1823. Based on the map of Ponts-et-Chaussées, under the direction of Barbié du Bocage (1760 1825) and drawn by J. Langlois. Printed in colours on wove paper. The legend in the lower margin explains the different colours as indicators of the geographical characteristics of the landscape ("This map illustrates the relief printing process, which requires 8 passes starting with blue, then red, brown, dark and light green, yellow and finally 2 passes of black. Each colour gives a topographical information", source BNF). All margins, not trimmed. 48,5 x 54 cm. Condition B (foxing and traces of oxidation in the margins; tiny pinholes at the head and foot).