Skeleton map of the territory of the United States west of the Mississippi River : exhibiting the relations existing between lines and areas of explorations & surveys conducted under the auspices of the War Dept., giving the area of the public domain lying west of the 100th meridian of longitude, with an index illustration of a series of atlas maps proposed to be constructed on a scale of 1 inch to 8 mi
Shows dated routes of survey and exploration, forts, telegraph lines, and areas of Wheeler's survey expeditions.
"Prepared to accompany the Preliminary & progress report concerning the Expedition of 1872 & 1873."
Data table gives area in square miles of Wheeler's survey expeditions of 1869, 1871, and 1872; areas encompassed by the Survey of the 40th parallel; etc.
House exec. doc. 1, pt. 2, 43rd Congress, 1st sess.
Also available on the Internet through the David Rumsey Map Collection.