The principal objective of Lewis and Clark's Corps of Discovery 1804-06 was the mapping of the West to the Pacific Ocean. Clark’s final cartographic achievement was his 1814 engraved map. One of the great maps of all times, it is perhaps the single most influential one of the Amer. West, for it was upon this map that our modern understanding of the topography of that vast areas would evolve. The first pub. of the Lewis and Clark journals was Nicholas Biddle’s 1814 2-vol. chronological narrative containing the map. In 1998 there was another "run" of the map produced by means of offset lithography. Size: 2-1/2' long x 14". Tan. One thousand regular copies were printed, with Black plus 1 PMS ink for duotone.