"Reconnaissance Maps (Six Sheets and Profile) Showing the general features of the topography adjacent to the 49th Parallel from the Lake of the Woods to the Rocky Mountains", U.S. Government

Complete and matching set of all six maps, each sized as above. Congress in 1872 authorized a survey to determine and mark the U.S. - Canadian Boundary line along the 49th parallel. The survey accurately determined the boundary, and added very detailed topographical features in a 5-mile wide strip along the line. The survey was completed in 1875 and published by Archibald Campbell and William Twining in 1878. Fine set of lithographed maps in remarkable condition.

References: Wheat (TMW) #1289.

Condition: A+

Last sheet has mis-folded area affecting only the margin.