Another interesting sheet published by the German cartographic powerhouse that was Petermann. This features three maps on one sheet, looking at the progress of survey and triangulation, with a map at top that looks at the entire country, from the 6th principal Meridian, to the Missouri River, or the West Coast. Below it on the left is a fine smaller map for the triangulation from western Colorado throughout Utah and the "Great Salt Lake Baseline". Shows amazing detail for topography and placenames. To a right a smaller image of the continent.
Condition is very good. Image size is approximately 11 x 11.5 (inches)