Map of the Nassau region of Germany, formerly a county and later a duchy; now in west Hesse and north-east Rhineland-Palatinate states. Relief shown pictorially. French text on verso with caption title: Description de la Comté de Nassau; p. 437, 440; signature Rrrrr 4. From: Gerardi Mercatoris et I. Hondii Atlas, ou, Réprésentation du monde ... , vol. 2. p. 437.